2022/08/15 更新

写真a

タナカ ヒロフミ
田中 啓文
TANAKA Hirofumi
Scopus 論文情報  
総論文数: 0  総Citation: 0  h-index: 14

Citation Countは当該年に発表した論文の被引用数

所属
大学院生命体工学研究科 人間知能システム工学専攻
職名
教授
メールアドレス
メールアドレス
研究室電話
093-695-6157
研究室FAX
093-695-6157
外部リンク

研究キーワード

  • カーボンナノチューブ

  • グラフェンナノリボン

  • 脳型デバイス

研究分野

  • ナノテク・材料 / ナノ材料科学

取得学位

  • 大阪大学  -  博士(工学)   1999年03月

学内職務経歴

  • 2020年04月 - 現在   九州工業大学   先端研究・社会連携本部   ニューロモルフィックAIハードウェア研究センター     センター長

  • 2018年04月 - 2020年03月   九州工業大学   大学院生命体工学研究科   人間知能システム工学専攻     専攻長

  • 2014年04月 - 現在   九州工業大学   大学院生命体工学研究科   人間知能システム工学専攻     教授

学外略歴

  • 2022年04月 - 2025年03月   大阪大学   理学研究科フォアフロント研究センター   招へい教授   招へい教授   日本国

  • 2019年11月 - 現在   スラナリー工科大学   卓越教授   タイ王国

  • 2018年05月 - 現在   ベトナム国家大学 ホーチミン工科大学   招聘教授   ベトナム社会主義共和国

  • 2014年04月 - 2018年03月   大阪大学   大学院理学研究科   招聘教授   日本国

  • 2008年04月 - 2014年03月   大阪大学   大学院理学研究科 化学専攻   助教   日本国

  • 2007年04月 - 2008年03月   自然科学研究機構   分子科学研究所 分子スケールナノサイエンスセンター   助教   日本国

  • 2003年10月 - 2007年03月   岡崎国立共同研究機構(平成16年4月~:自然科学研究機構)   分子科学研究所 分子スケールナノサイエンスセンター   助手   日本国

  • 2002年04月 - 2003年09月   ペンシルバニア州立大学   理学部   博士研究員   日本国

  • 1999年04月 - 2002年03月   理化学研究所   表面界面工学研究室   基礎科学特別研究員   日本国

  • 1998年04月 - 1999年03月   日本学術振興会   日本学術振興会特別研究員   日本国

▼全件表示

所属学会・委員会

  • 2017年04月 - 現在   IMAA   インド

  • 2016年04月 - 現在   ナノ学会   日本国

  • 2016年04月 - 現在   アメリカ電子通信学会   アメリカ合衆国

  • 2015年01月 - 現在   応用物理学会 分子バイオエレクトロニクス分科会   日本国

論文

  • Emergence of In-Materio Intelligence from an Incidental Structure of a Single-Walled Carbon Nanotube–Porphyrin Polyoxometalate Random Network 査読有り 国際誌

    Deep Banerjee, Takumi Kotooka, Saman Azhari, Yuki Usami, Takuji Ogawa, James K. Gimzewski, Hakaru Tamukoh, and Hirofumi Tanaka

    Advanced Intelligent Systems ( Wiley )   4 ( 4 )   2100145   2022年01月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Hardware-based machine intelligence with the network architecture of reservoir computing (RC) is gaining interest because of its biological computational resemblance along with an easy and efficient neural network training approach. Herein, such a physical RC (in-materio RC) platform consisting of a recurrent network formed by the single-walled carbon nanotube (SWNT)–porphyrin polyoxometalate (Por–POM) complex is demonstrated. The network architecture executes the fundamental reservoir properties of nonlinearity, higher harmonic generation, and 1/f γ power law information processing ability. Based on these functionalities, an RC benchmark task of waveform generation is performed where the device achieves maximum fitting accuracy of 99.4%. Furthermore, a supervised object classification task based on a one-hot vector target is also executed using Toyota Human Support Robot tactile inputs. The successful classification of objects of different hardness is enhanced when the device output response follows the 1/f γ power law of maximized information processing.

    DOI: 10.1002/aisy.202100145

    DOI: 10.1002/aisy.202100145

  • In-Materio Reservoir Computing in a Sulfonated Polyaniline Network 査読有り 国際誌

    Usami Y., van de Ven B., Mathew D.G., Chen T., Kotooka T., Kawashima Y., Tanaka Y., Otsuka Y., Ohoyama H., Tamukoh H., Tanaka H., van der Wiel W.G., Matsumoto T.

    Advanced Materials ( Wiley )   33 ( 48 )   2102688   2021年09月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    A sulfonated polyaniline (SPAN) organic electrochemical network device (OEND) is fabricated using a simple drop-casting method on multiple Au electrodes for use in reservoir computing (RC). The SPAN network has humidity-dependent electrical properties. Under high humidity, the SPAN OEND exhibits mainly ionic conduction, including charging of an electric double layer and ionic diffusion. The nonlinearity and hysteresis of the current–voltage characteristics progressively increase with increasing humidity. The rich dynamic output behavior indicates wide variations for each electrode, which improves the RC performance because of the disordered network. For RC, waveform generation and short-term memory tasks are realized by a linear combination of outputs. The waveform task accuracy and memory capacity calculated from a short-term memory task reach 90% and 33.9, respectively. Improved spoken-digit classification is realized with 60% accuracy by only 12 outputs, demonstrating that the SPAN OEND can manage time series dynamic data operation in RC owing to a combination of rich dynamic and nonlinear electronic properties. The results suggest that SPAN-based electrochemical systems can be applied for material-based computing, by exploiting their intrinsic physicochemical behavior.

    DOI: 10.1002/adma.202102688

    Scopus

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  • A molecular neuromorphic network device consisting of single-walled carbon nanotubes complexed with polyoxometalate 査読有り

    Tanaka H., Akai-Kasaya M., Termehyousefi A., Hong L., Fu L., Tamukoh H., Tanaka D., Asai T., Ogawa T.

    Nature Communications   9 ( 1 )   2018年08月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Author(s). In contrast to AI hardware, neuromorphic hardware is based on neuroscience, wherein constructing both spiking neurons and their dense and complex networks is essential to obtain intelligent abilities. However, the integration density of present neuromorphic devices is much less than that of human brains. In this report, we present molecular neuromorphic devices, composed of a dynamic and extremely dense network of single-walled carbon nanotubes (SWNTs) complexed with polyoxometalate (POM). We show experimentally that the SWNT/POM network generates spontaneous spikes and noise. We propose electron-cascading models of the network consisting of heterogeneous molecular junctions that yields results in good agreement with the experimental results. Rudimentary learning ability of the network is illustrated by introducing reservoir computing, which utilises spiking dynamics and a certain degree of network complexity. These results indicate the possibility that complex functional networks can be constructed using molecular devices, and contribute to the development of neuromorphic devices.

    DOI: 10.1038/s41467-018-04886-2

    Kyutacar

    Scopus

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  • Silicon nanodisk array with afinfield-effect transistor for time-domain weighted sum calculation toward massively parallel spiking neural networks 査読有り 国際誌

    Tohara T., Liang H., Tanaka H., Igarashi M., Samukawa S., Endo K., Takahashi Y., Morie T.

    Applied Physics Express   9 ( 3 )   2016年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A nanodisk array connected with a fin field-effect transistor is fabricated and analyzed for spiking neural network applications. This nanodevice performs weighted sums in the time domain using rising slopes of responses triggered by input spike pulses. The nanodisk arrays, which act as a resistance of several giga-ohms, are fabricated using a self-assembly bio-nano-template technique. Weighted sums are achieved with an energy dissipation on the order of 1 fJ, where the number of inputs can be more than one hundred. This amount of energy is several orders of magnitude lower than that of conventional digital processors.

    DOI: 10.7567/APEX.9.034201

    Scopus

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  • Method for Controlling Electrical Properties of Single-Layer Graphene Nanoribbons via Adsorbed Planar Molecular Nanoparticles 査読有り 国際誌

    H. Tanaka , R. Arima, M. Fukumori, D. Tanaka, R. Negishi, Y. Kobayashi, S. Kasai, T. K. Yamada, T. Ogawa

    Sci. Rep.   2015年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1038/srep12341

    Scopus

  • Visible fluorescence induced by the metal semiconductor transition in composites of carbon nanotubes with noble metal nanoparticles 査読有り

    Subramaniam C., Sreeprasad T., Pradeep T., Pavan Kumar G., Narayana C., Yajima T., Sugawara Y., Tanaka H., Ogawa T., Chakrabarti J.

    Physical Review Letters   99 ( 16 )   2007年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We show that single-walled carbon nanotube (SWNT) bundles emit visible fluorescence in the presence of noble metal nanoparticles and nanorods in the solid state. Conductivity measurements with metallic nanotubes, isolated from pristine SWNTs, show that they become semiconducting in the presence of the metal nanoparticles. Nanoparticle binding increases the defects in the nanotube structures which is evident in the Raman spectra. The metal-semiconductor transition removes the nonradiative decay channels of the excited states enabling visible fluorescence. Nanotube structures are imaged using this emission with resolution below the classical limits. © 2007 The American Physical Society.

    DOI: 10.1103/PhysRevLett.99.167404

    Scopus

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  • Porphyrin molecular nanodevices wired using single-walled carbon nanotubes 査読有り

    Tanaka H., Yajima T., Matsumoto T., Otsuka Y., Ogawa T.

    Advanced Materials   18 ( 11 )   1411 - 1415   2006年06月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The fabrication of porphyrin molecular nanodevices wired using single-walled carbon nanotubes (SWNT) was investigated. 5,15- bispentylporphyrinato zinc (BPP-Zn) with two pentyl group with two phenyl groups was synthesized to increase the solubility of its SWNT complex in organic solvents. The solution was cast on mica substrate and the surface was observed by tapping-mode atomic force microscopy (AFM). The BPP-Zn complex was observed on the SWNTs as white dots with thicknesses of 2.5-4.5 nm. molecular aggregates of excess BPP-Zn were also seen to be spread across the substrate. The SWNT-wiring method and PCI-AFM can be very effectively combined to measure transport across single or several molecules. This combination allows the simultaneous observation of the topography of the molecules on the electrode during measurement.

    DOI: 10.1002/adma.200501249

    Scopus

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  • Hybrid approaches to nanolithography: Photolithographic structures with precise, controllable nanometer-scale spacings created by molecular rulers 査読有り

    Anderson M., Mihok M., Tanaka H., Tan L., Horn M., McCarty G., Weiss P.

    Advanced Materials   18 ( 8 )   1020 - 1022   2006年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The molecular-ruler nanolithography process was used to create photolithographic structures with precise controllable nanometer-scale spacings. This process utilized the selective placement and controlled thickness of self-assembled multilayers to form precise molecular-ruler resists. Some of the advantages of the process include the features of high-resolution and precision, selective deposition, compatibility with different forms of lithographic processing, low production cost, and mild processing conditions. The precise molecular-ruler resists were used to define nanometer-scale spacings between initial and subsequently registered photolithographically patterned structures. Parallel hybrid methodologies used two techniques in combination to fabricate structures that interface nanometer- and micrometer-scale components.

    DOI: 10.1002/adma.200600108

    Scopus

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  • In-materio reservoir working at low frequencies in a Ag2S-island network 査読有り 国際誌

    Motoharu Nakajima, Kazuki Minegishi, Yosuke Shimizu, Yuki Usami, Hirofumi Tanaka, Tsuyoshi Hasegawa

    Nanoscale ( The Royal Society of Chemistry )   14 ( 20 )   7634 - 7640   2022年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • In-materio computing in random networks of carbon nanotubes complexed with chemically dynamic molecules: a review 査読有り 国際誌

    Hirofumi Tanaka, Saman Azhari, Y Usami, D Banerjee, T Kotooka, O Srikimkaew, T-T Dang, S Murazoe, R Oyabu, K Kimizuka, M Hakoshima

    Neuromorphic Computing and Engineering ( IOP Publishing )   2 ( 2 )   022002   2022年04月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

  • Droplet size controllable fabrication of Pickering emulsion stabilized by soy protein isolate-carbon nanotubes/carboxymethyl cellulose sodium 査読有り 国際誌

    Xiang Li, Fantian Wang, Jiaxin Ma, Haibiao Zhu, Rui Yang, Hirofumi Tanaka, Xiaoming Ma, Liu Hong

    Soft Materials   20 ( 2 )   240 - 249   2022年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • Toward Automated Tomato Harvesting System: Integration of Haptic Based Piezoresistive Nanocomposite and Machine Learning 査読有り

    Azhari S., Setoguchi T., Sasaki I., Nakagawa A., Ikeda K., Azhari A., Hasan I.H., Hamidon M.N., Fukunaga N., Shibata T., Tanaka H.

    IEEE Sensors Journal   21 ( 24 )   27810 - 27817   2021年12月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Carbon nanotubes (CNT)/polydimethylsiloxane (PDMS) have been investigated as potential materials for tomato-harvesting applications. The current-voltage (I-V) and current time (I-t) properties, as well as tomato hardness measurement and support-vector machine learning, were used to determine the performance of the sensor with respect to sensitivity, response time, accuracy, and detection limit of the nanocomposite. The data suggested an accurate (± 5.2%) measurement in a low-weight region of tomato. Narrowing of the I-V hysteresis curve towards a higher weight region was observed as a result of the increase in electron pathways. The fabricated sensor displayed a higher sensitivity (15 mV / mu text{m} ) than the commercial sensor (1 mV / mu text{m} ). In addition, machine learning of the resistance-displacement curve data yielded an average accuracy level of 0.67 when tested using acquired data.

    DOI: 10.1109/JSEN.2021.3124914

    Scopus

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  • Observation of Cu spin fluctuations in high-T<inf>c</inf> cuprate superconductor nanoparticles investigated by muon spin relaxation 査読有り

    Winarsih S., Budiman F., Tanaka H., Adachi T., Koda A., Horibe Y., Kurniawan B., Watanabe I., Risdiana R.

    Nanomaterials   11 ( 12 )   2021年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The nano-size effects of high-Tc cuprate superconductor La2−xSrxCuO4 with x = 0.20 are investigated using X-ray diffractometry, Transmission electron microscopy, and muon-spin relaxation (µSR). It is investigated whether an increase in the bond distance of Cu and O atoms in the conducting layer compared to those of the bulk state might affect its physical and magnetic properties. The µSR measurements revealed the slowing down of Cu spin fluctuations in La2−xSrxCuO4 nanoparticles, indicating the development of a magnetic correlation at low temperatures. The magnetic correlation strengthens as the particle size reduces. This significantly differs from those observed in the bulk form, which show a superconducting state below Tc. It is indicated that reducing the particle size of La2−xSrxCuO4 down to nanometer size causes the appearance of magnetism. The magnetism enhances with decreasing particle size.

    DOI: 10.3390/nano11123450

    Scopus

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  • Room temperature demonstration of in-materio reservoir computing for optimizing Boolean function with single-walled carbon nanotube/porphyrin-polyoxometalate composite 査読有り

    Banerjee D., Azhari S., Usami Y., Tanaka H.

    Applied Physics Express   14 ( 10 )   2021年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    A method for room temperature demonstration of in-materio reservoir computing (RC) with a single-walled carbon nanotube/porphyrin-polyoxometalate network (SWNT/Por-POM) is proposed. Boolean functions of OR, AND, NOR, NAND, XOR, and XNOR, all were reconstructed with an accuracy >90% via supervised training of linear voltage readouts. The RC pre-requisite of echo-state property and recurrent connection allowed for consistent performances over multiple test datasets and time-shifted target sequences. Moreover, a non-zero machine intelligence index confirmed the presence of negative differential resistance dynamics, incorporating in SWNT/Por-POM the mathematical equivalence of additive and subtractive functions, thereby aiding the construction of such complex Boolean functions.

    DOI: 10.35848/1882-0786/ac24db

    Scopus

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  • Droplet size controllable fabrication of Pickering emulsion stabilized by soy protein isolate-carbon nanotubes/carboxymethyl cellulose sodium 査読有り

    Li X., Wang F., Ma J., Zhu H., Yang R., Tanaka H., Ma X., Hong L.

    Soft Materials   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Pickering emulsion plays an important role in various industrial fields including food, catalysis, and bioscience. Soy protein isolate (SPI) has been proved feasible for stabilizing Pickering emulsion after modification, though such methods were either difficult to proceed or application restrictive. Herein, we report a simple fabrication of oil-in-water Pickering emulsion using a complex of SPI and carbon nanotubes (CNTs)/carboxymethyl cellulose sodium (CMC-Na). The stability of our emulsion could be kept at a wide range of CNTs diameter, oil fraction, and pH, while the emulsion droplet size might be controlled through the tuning of pH and dispersed phase solvent as well. A strong interaction between SPI and CNTs/CMC-Na is a key factor for the homogeneous distribution of CNTs at the aqueous–organic interface, which benefits the Pickering emulsion formation. Our work will offer some useful thoughts for improving the stability of protein-integrated emulsion.

    DOI: 10.1080/1539445X.2021.1996393

    Scopus

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  • Performance of Ag-Ag<inf>2</inf>S core-shell nanoparticle-based random network reservoir computing device 査読有り 国際誌

    Hadiyawarman , Usami Y., Kotooka T., Azhari S., Eguchi M., Tanaka H.

    Japanese Journal of Applied Physics   60 ( SC )   2021年06月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Reservoir computing (RC), a low-power computational framework derived from recurrent neural networks, is suitable for temporal/sequential data processing. Here, we report the development of RC devices utilizing Ag-Ag2S core-shell nanoparticles (NPs), synthesized by a simple wet chemical protocol, as the reservoir layer. We examined the NP-based reservoir layer for the required properties of RC hardware, such as echo state property, and then performed the benchmark tasks. Our study on NP-based reservoirs highlighted the importance of the dynamics between the NPs as indicated by the rich high dimensionality due to the echo state property. These dynamics affected the accuracy (up to 99%) of the target waveforms that were generated with a low number of readout channels. Our study demonstrates the great potential of Ag-Ag2S NPs for the development of next-generation RC hardware.

    DOI: 10.35848/1347-4065/abe206

    Scopus

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  • Crossover point of the field effect transistor and interconnect applications in turbostratic multilayer graphene nanoribbon channel 査読有り

    Negishi R., Yamamoto K., Tanaka H., Mojtahedzadeh S.A., Mori N., Kobayashi Y.

    Scientific Reports   11 ( 1 )   2021年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The electrical transport properties of a turbostratic multilayer graphene nanoribbon (GNR) with various number of layers (1–8 layers) were investigated using a field effect transistor with a single GNR channel. In the turbostratic multilayer GNR with 5 layers or less, the carrier mobility and I /I ratio in the FETs were improved by slightly increasing the conductance with increasing the number of layers, meaning that the excellent semiconducting characteristic. The improvement of the carrier transport properties promotes by the turbostratic stacking structure. In the turbostratic multilayer GNR with 6 layers or more, although the I /I ratio degraded, the conductance extremely improved with increasing the number of layers. This indicates that the turbostratic multilayer GNR with thicker number of layers becomes the significantly lower resistivity wire as a metallic characteristic. We revealed that the crossover point of the physical properties between the semiconducting and metallic characteristics is determined by the strength to screen the surrounding environment effects such as charged impurity on the substrate. Our comprehensive investigation provides a design guidance for the various electrical device applications of GNR materials. on off on off

    DOI: 10.1038/s41598-021-89709-z

    Scopus

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  • Reservoir computing enhancement in three-dimensional porous CNT-POM network

    Azhari Saman, Banerjee Deep, Kotooka Takumi, Usami Yuki, Tanaka Hirofumi

    応用物理学会学術講演会講演予稿集 ( 公益社団法人 応用物理学会 )   2021.1 ( 0 )   263 - 263   2021年02月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(研究会,シンポジウム資料等)

    DOI: 10.11470/jsapmeeting.2021.1.0_263

    CiNii Research

  • Facile solvent mixing strategy for extracting highly enriched (6,5)single-walled carbon nanotubes in improved yield 査読有り

    Zhu H., Hong L., Tanaka H., Ma X., Yang C.

    Bulletin of the Chemical Society of Japan ( 公益社団法人 日本化学会 )   94 ( 4 )   1166 - 1171   2021年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Selective sorting of semiconducting single-walled carbon nanotubes (SWNTs) of single chirality is critical for constructing electronic nanodevices with high performance. Nevertheless, trade-off between yield and chirality purity often exists in conventional SWNTs sorting processes. To solve this problem, we present an extremely facile method for enriching SWNTs with both high yield and high chiral selectivity. Simply by using a solvent mixed with toluene and chlorobenzene at certain volume ratio, the sorting yield of (6,5)SWNTs was largely enhanced via polymer extraction, while the chirality purity of sorted SWNTs could be kept high as well. We further proved that the sorting efficiency would not be lowered even after multiple extractions, while the chirality selectivity of the obtained SWNTs was dependent on exact ratio between the two solvents. Solvent polarity-controlled polymer (or solvent molecule)-SWNTs interaction was believed responsible for our results, which was later successfully testified by molecular dynamics simulations. Our proposed strategy will simplify the selecting process of single chiral SWNTs and benefit the optimization of SWNTs-integrated devices in near future.

    DOI: 10.1246/bcsj.20200370

    Scopus

    CiNii Research

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  • Wirelessly powered dielectrophoresis of metal oxide particles using spark-gap Tesla coil 査読有り

    Budiman F., Silalahi D.K., Muhamad B., Fathurahman M.R., Rozana M., Tanaka H.

    Electrophoresis   41 ( 24 )   2159 - 2165   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Wiley-VCH GmbH Wirelessly powered dielectrophoresis (DEP) of metal oxide particles was performed using a spark-gap Tesla coil (TC). The main contribution of this work is the simplification of the conventional DEP setup that requires attaching wires directly to the electrodes. Wireless power from the TC generates a high output frequency and voltage, which corresponds to that used for the DEP. Therefore, a spark-gap TC was built and utilized to conduct the DEP process. Metal oxides (ZnO and Fe2O3) were used as targets for the assembly. The results showed that the wirelessly powered DEP technique via a TC was successful in assembling the metal oxide particles. Positive and negative DEP phenomena were observed. Positive DEP occurred during ZnO assembly, making particles chain grow 0.92 mm toward the sparks within 60 s. Negative DEP was observed during Fe2O3 assembly, where the repulsion of particles formed a void around the sparks with a 1.45 mm radius. The mechanism of this wireless DEP system is discussed.

    DOI: 10.1002/elps.202000102

    Scopus

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  • Frequency dependence dielectrophoresis technique for bridging graphene nanoribbons 査読有り

    Aji W.W., Usami Y., Hadiyawarman , Oyabu R., Tanaka H.

    Applied Physics Express   13 ( 10 )   2020年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 The Japan Society of Applied Physics We succeeded in bridging unzipped graphene nanoribbons (GNRs) and separating them from unwanted single-walled carbon nanotubes (SWNTs) using a frequency-dependent dielectrophoresis (DEP) method by varying the frequency and applied voltage used for future assembly. Atomic force micrographs and Raman spectra proved that unzipped GNRs were successfully bridged by the DEP method at frequencies higher than 13 MHz. The theoretical calculation also supported the finding that only GNRs were collected from a mixture of SWNTs/GNRs suspensions.

    DOI: 10.35848/1882-0786/abb68d

    Scopus

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  • Controllable synthesis of MoS2/graphene low-dimensional nanocomposites and their electrical properties 査読有り 国際誌

    L.-N. Long, P.-T. Thi, P.-T. Kien, P.-T., Trung, M. Ohtani, Y. Kumabe, H. Tanaka, S. Ueda, H. Lee, P.-B. Thang, T.-V. Khai

    Appl. Surf. Sci.   504   144193   2020年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.apsusc.2019.144193

  • Pulse Generation Behavior of Single-Walled Carbon Nanotube/ Polyoxometalate Complex Random Network 査読有り 国際誌

    D. Banerjee, Y. Xinguang, D. G. O. Hernowo, H. Tanaka, Y. Yamazaki, T. Ogawa

    Kalpa Publications in Engineering   3   150 - 153   2020年02月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    ベトナム   ホーチミン市  

  • Control of the neuromorphic learning behavior based on the aggregation of thiol-protected Ag-Ag<inf>2</inf>S core-shell nanoparticles 査読有り

    Hadiyawarman , Eguchi M., Tanaka H.

    Japanese Journal of Applied Physics   59 ( 1 )   2020年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Japan Society of Applied Physics. The neuromorphic learning switching behavior was investigated in electric devices that were constructed based on the aggregation of thiol-stabilized Ag/Ag2S core-shell nanoparticles (NPs). The NPs were synthesized using the two-phase modified Brust-Schiffrin procedure and exhibited Ag-S and Ag-S-R bonding states at the surfaces of Ag NPs. The memristive behavior of such a device at room temperature under ambient pressure, which can be used to emulate the functions of biological synapses with long and short memories, is achieved. The importance of the Ag2S and the thiol layer at the surface of Ag NPs for the demonstration of learning behavior, such as the potentiation and depression of synapses in the human brain is explained.

    DOI: 10.7567/1347-4065/ab5c77

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  • Variable range hopping resistivity in la<inf>2-x</inf>srxcuo<inf>4</inf> nanoparticles evaluated by four point probe method 査読有り

    Winarsih S., Budiman F., Tanaka H., Adachi T., Goto T., Soegijono B., Kurniawan B., Watanabe I.

    Key Engineering Materials   860 KEM   142 - 147   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 Trans Tech Publications Ltd, Switzerland. We report the results of the resistivity measurement on La2-xSrxCuO4 nanoparticles with x = 0, 0.05, and 0.20 evaluated by the four-point probe method. The high resistivity value shows the predominance of the inter-grain part. The temperature dependence of the conductivity can be analyzed by variable range hopping model showing the charge carriers are formed by thermal activation. There is no superconducting behavior that could be observed in La2-xSrxCuO4 nanoparticles with x = 0.05 and 0.20.

    DOI: 10.4028/www.scientific.net/KEM.860.142

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  • Variable Range Hopping Resistivity in La2-xSrxCuO4 Nanoparticles Evaluated by Four Point Probe Method 査読有り 国際誌

    S. Winarsih, F. Budiman, H. Tanaka, T. Adachi, T. Goto, B. Soegijono, B. Kurniawan, I. Watanabe

    Key Eng. Mater.   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • 物理リザバーに向けたポリアニリン-金微粒子ランダムネットワークの構築

    川嶋 悠哉, 宇佐美 雄生, 琴岡 匠, 田中 啓文, 松本 卓也

    日本表面真空学会学術講演会要旨集 ( 公益社団法人 日本表面真空学会 )   2020 ( 0 )   268   2020年01月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)

    <p>リザバーコンピューティング(RC)は、リザバー層で行われる演算を物理現象に置換することができる情報処理システムである。我々は、自己ドープ型ポリアニリン分子(SPAN)と Au ナノ粒子(AuNP)からなるネットワーク内に非線形 <i>I-V </i>特性が発生することを明らかにしている。本研究では、RCへの適用可能性を探るため、ナノギャップ電極によって多入力多出力電極間での非線形電気特性および記憶特性を検討した。</p>

    DOI: 10.14886/jvss.2020.0_268

    CiNii Article

    CiNii Research

    その他リンク: https://ci.nii.ac.jp/naid/130007959456

  • 単層カーボンナノチューブとポリ酸によるニューロモルフィックランダムネットワークデバイス(招待) 招待有り 査読有り

    田中 啓文

    電子情報通信学会 和文誌C   J103-C1   53 - 60   2020年01月

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    担当区分:筆頭著者, 最終著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)

    CiNii Research

  • Three site molecular orbital controlled single-molecule rectifiers based on perpendicularly linked porphyrin-imide dyads 査読有り

    Handayani M., Tanaka H., Katayose S., Ohto T., Chen Z., Yamada R., Tada H., Ogawa T.

    Nanoscale   11 ( 47 )   22724 - 22729   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The original single-molecule rectifier proposed by Aviram and Ratner is based on a donor-σ-acceptor structure, in which σ functions as the insulator to disconnect the π electronic systems of the two parts. However, there have been no reports on experimentally demonstrated highly efficient single-molecule rectifiers based on this mechanism. In this paper, we demonstrate single-molecule rectifiers with perpendicularly connected metal porphyrin-imide dyads. Our proposed molecule rectifiers use hydroxyl groups at both ends as weak anchoring groups. Measurements of the single-molecule current-voltage characteristics of these molecules clearly show that the rectification ratio reached a high value of 14 on average. Moreover, the ratio could be tuned by changing the central metal in the porphyrin core. All of these features can be explained by the energy-level shift of the molecular orbital using a model with three electronic parts.

    DOI: 10.1039/c9nr07105a

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  • Effect of Synthesis Procedure on the Size of Ag/Ag<inf>2</inf>S Core-Shell Nanoparticles for Memristive Brain-Like Devices 査読有り

    Nakao Y., Oradee S., Tukiman H., Tanaka H.

    Proceedings of the 2019 IEEE Regional Symposium on Micro and Nanoelectronics, RSM 2019   79 - 82   2019年08月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2019 IEEE. For several decades, 'von Neumann' computers have been downsized while their performances have been improved. However, the downsizing has reached its limit, imposed by the tunneling effect in the transistor, which also prevents energy consumption. To overcome such limitations, neuromorphic devices have been proposed, which exhibit high performances with significantly low power consumption. In this study, we realize a neuromorphic device based on Ag/Ag2S nanoparticles, which have a switching behavior and allow the easy fabrication of a random network for reservoir computing. We start by fabricating particles with a desired particle size distribution. The amount of allylmercaptan (AM), which is a source of sulfur, was varied in the synthesis stage, and the obtained particles sizes were compared. By changing the concentration of AM, the sizes of Ag/Ag2S core-shell nanoparticles were successfully controlled, which allow us to achieve reservoir computing by aggregation of the particles.

    DOI: 10.1109/RSM46715.2019.8943543

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  • Facile preparation of hybrid thin films composed of spin-crossover nanoparticles and carbon nanotubes for electrical memory devices 査読有り

    Tanaka D., Aketa N., Tanaka H., Horike S., Fukumori M., Tamaki T., Inose T., Akai T., Toyama H., Sakata O., Tajiri H., Ogawa T.

    Dalton Transactions   48 ( 21 )   7074 - 7079   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Royal Society of Chemistry. In this study, organic solvent-dispersible nanoparticles of an FeII-1,2,4-triazole spin-crossover complex were synthesized. On mixing the suspension of the spin-crossover nanoparticles with a solution of single-walled carbon nanotubes (SWCNTs), the nanoparticles were strongly adsorbed on the hydrophobic SWCNT bundles, resulting in hybrid network structures. Variable temperature DC electrical conductivity measurements of the hybrid network thin films demonstrated that the conductivities of the composite films were switched by the spin transition of the nanoparticles.

    DOI: 10.1039/c8dt02923g

    Scopus

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  • トマト収穫自動化に向けた、高感度ピエゾ抵抗ナノ複合材料触覚センサ

    池田 健吾, 佐々木 巌, サマン アズハリ, 瀬戸口 卓也, 中川 新, ニザール ハミドン, 田中 啓文

    日本表面真空学会学術講演会要旨集 ( 公益社団法人 日本表面真空学会 )   2019 ( 0 )   1Ca12   2019年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    <p>CNT / PDMS複合材料をトマト収穫用触覚センサとして構成し、I-VおよびI-t特性を調査した。導電パスの増加により、I-V曲線は高重量領域に向かって減少した。硬度測定の結果、トマトの低重量領域において正確で安定した測定が可能となり、 市販のセンサよりも高い感度を示した。トマトの成熟度を判別するためにサポートベクターマシンによる機械学習を行った。その結果、0.67の判別精度であった。</p>

    DOI: 10.14886/jvss.2019.0_1Ca12

    CiNii Article

    CiNii Research

    その他リンク: https://ci.nii.ac.jp/naid/130007737480

  • Growth of free-standing la2-xsrxcuo4 nanoparticles 査読有り

    Winarsih S., Budiman F., Tanaka H., Adachi T., Goto T., Soegijono B., Kurniawan B., Watanabe I.

    Materials Science Forum   966 MSF   357 - 362   2019年01月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2019 Trans Tech Publications Ltd, Switzerland. Nano-size effect on structure of crystal of free-standing La2-xSrxCuO4 (LSCO) nanoparticles was observed to reveal size effects of La-based high-Tc superconducting oxides. Lattice parameters were estimated by changing temperature and time of sintering. It is concluded that heat treatment plays a key role in controlling particle size of sample. Lattice distortions will occur when the particle size of sample becomes smaller.

    DOI: 10.4028/www.scientific.net/MSF.966.357

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  • Energy gap opening by crossing drop cast single-layer graphene nanoribbons 査読有り

    Energy gap opening by crossing drop cast singleToyo Kazu Yamada, Hideto Fukuda, Taizo Fujiwara, Polin Liu, Kohji Nakamura, Seiya Kasai, Amadeo L Vazquez de Parga, Hirofumi Tanaka

    Nanotechnology   29   315705   ページは論文番号。全10ページ   2018年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1088/1361-6528/aac36b/meta

  • Electric property measurement of free-standing SrTiO<inf>3</inf>nanoparticles assembled by dielectrophoresis 査読有り

    Budiman F., Kotooka T., Horibe Y., Eguchi M., Tanaka H.

    Japanese Journal of Applied Physics   57 ( 6 )   2018年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Japan Society of Applied Physics. Free-standing strontium titanate (SrTiO3/STO) nanoparticles (NPs) were synthesized by the sol-gel method. X-ray diffractometry revealed that the required minimum annealing temperature to synthesize pure and highly crystalline STO NPs was 500 °C. Moreover, morphological observation by field emission scanning electron microscopy showed that the STO NPs have a spherical structure and their size depended on annealing condition. Electrical properties were measured using a low-temperature probing system. Here, an electrode was fabricated by electron beam lithography and the synthesized STO NPs were aligned at the electrodes by dielectrophoresis. The conductance of a sample was proportional to temperature. Two conduction mechanisms originating from hopping and tunneling appeared in the Arrhenius plot.

    DOI: 10.7567/JJAP.57.06HE07

    Scopus

    CiNii Article

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  • Recent progress on fabrication of memristor and transistor-based neuromorphic devices for high signal processing speed with low power consumption 査読有り

    Hadiyawarman, Budiman F., Hernowo D., Pandey R., Tanaka H.

    Japanese Journal of Applied Physics   57 ( 3 )   2018年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Japan Society of Applied Physics. The advanced progress of electronic-based devices for artificial neural networks and recent trends in neuromorphic engineering are discussed in this review. Recent studies indicate that the memristor and transistor are two types of devices that can be implemented as neuromorphic devices. The electrical switching characteristics and physical mechanism of neuromorphic devices based on metal oxide, metal sulfide, silicon, and carbon materials are broadly covered in this review. Moreover, the switching performance comparison of several materials mentioned above are well highlighted, which would be useful for the further development of memristive devices. Recent progress in synaptic devices and the application of a switching device in the learning process is also discussed in this paper.

    DOI: 10.7567/JJAP.57.03EA06

    Scopus

    CiNii Article

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  • Effects of radical initiators, polymerization inhibitors, and other agents on the sonochemical unzipping of double-walled carbon nanotubes 査読有り

    Fukumori M., Hara S., Ogawa T., Tanaka H.

    Japanese Journal of Applied Physics   57 ( 3 )   2018年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Japan Society of Applied Physics. The mechanism of graphene nanoribbon synthesis by the sonication-assisted unzipping of carbon nanotubes (CNTs) was investigated utilizing 4-methoxyphenol and 1,4-dimethoxybenzene as moieties of poly[(m-phenylenevinylene)-co-(2,5-dioctoxy-p-phenylenevinylene)]. The obtained results revealed that unzipping was promoted by 4-methoxyphenol owing to the facile abstraction of its phenolic hydrogen by sonication-generated radicals on CNTs, whereas 1,4-dimethoxybenzene did not facilitate unzipping, since its methoxy hydrogens were hardly abstracted. Moreover, unzipping was also facilitated by trans-stilbene, the double bond of which reacts with CNT radicals. Furthermore, we succeeded in using a general radical initiator, namely, 2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride to promote unzipping, confirming that it is promoted by radical donors/trapping agents.

    DOI: 10.7567/JJAP.57.03ED01

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  • Self-assembly and ring-opening metathesis polymerization of cyclic conjugated molecules on highly ordered pyrolytic graphite 査読有り

    Chiu S., Chiang H., Lin Y., Lu Y., Tanaka H., Hosokai T., Horie M.

    Chemical Communications   54 ( 44 )   5546 - 5549   2018年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 The Royal Society of Chemistry. Cyclic conjugated monomers comprising cyclopentadithiophene-vinylene trimers and their polymers on HOPG are observed using STM and AFM. ROMP of the monomers is performed using a Grubbs catalyst. Their STM images exhibit single chains of planar polymers, whereas their AFM images show elongation of the polymer chains on HOPG.

    DOI: 10.1039/c8cc02224k

    Scopus

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  • Development of Frequency Based Taste Receptors Using Bioinspired Glucose Nanobiosensor 査読有り

    Termehyousefi A., Tateno K., Bagheri S., Tanaka H.

    Scientific Reports   7 ( 1 )   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 The Author(s). A method to fabricate a bioinspired nanobiosensor using electronic-based artificial taste receptors for glucose diagnosis is presented. Fabricated bioinspired glucose nanobiosensor designated based on an artificial taste bud including an amperometric glucose biosensor and taste bud-inspired circuits. In fact, the design of the taste bud-inspired circuits was inspired by the signal-processing mechanism of taste nerves which involves two layers. The first, known as a type II cell, detects the glucose by glucose oxidase and transduces the current signal obtained for the pulse pattern is conducted to the second layer, called type III cell, to induce synchronisation of the neural spiking activity. The oscillation results of fabricated bioinspired glucose nanobiosensor confirmed an increase in the frequency of the output pulse as a function of the glucose concentration. At high glucose concentrations, the bioinspired glucose nanobiosensor showed a pulse train of alternating short and long interpulse intervals. A computational analysis performed to validate the hypothesis, which was successfully reproduced the alternating behaviour of bioinspired glucose our nanobiosensor by increasing the output frequency and alternation of pulse intervals according to the reduction in the resistivity of the biosensor.

    DOI: 10.1038/s41598-017-01855-5

    Scopus

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  • Sequential experimental strategies of longitudinal unzipping of SWNTs: Selective width of single layer graphene nanoribbon 招待有り 査読有り

    Furuki H., Fujiwara T., TermehYousefi A., Tanaka H.

    Proceedings of the 2017 IEEE Regional Symposium on Micro and Nanoelectronics, RSM 2017   171 - 174   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 IEEE. Single-layer graphene nanoribbon (sGNR) is a naturally good conductor and is a promising material for use as nanowiring in next generation computers. We have investigated a new fabrication method of sGNR by using a sonochemical technique to facilitate longitudinal unzipping of single-walled carbon nanotubes. The optimization of the fabrication process is discussed using a statistical analysis method of "Design of Experiment" to obtain the longest sGNR by unzipping of SWNT. The obtained results will contribute to downscaling of integrated circuits in the near future.

    DOI: 10.1109/RSM.2017.8069173

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  • Fabrication of piezoresistive based pressure sensor via purified and functionalized CNTs/PDMS nanocomposite: Toward development of haptic sensors 査読有り

    Azhari S., Termeh Yousefi A., Tanaka H., Khajeh A., Kuredemus N., Mansouri Bigdeli M., Hamidon M.

    Sensors and Actuators, A: Physical   266   158 - 165   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Elsevier B.V. In this work, we reported a chemically modified technique via screen printing method to fabricate carbon nanotubes (CNTs)/Polydimethylsiloxane (PDMS) nanocomposite to monitor the piezoresistive behavior of nanocomposite while applying pressure. Raman, UV/vis and HRTEM results were utilized to verify the quality of CNTs, purified through chemical and physical treatments; carboxylic and hydroxylic functional groups were determined via FTIR. The optimum dispersion ratio of the nanocomposite was observed by FESEM images which clearly show the consistent dispersion of CNTs coated by PDMS. Furthermore, I–V characterization of the developed nanocomposite indicates change in resistivity for a few orders of magnitude before and after treatment in addition to resistance variation as a result of different appl ied pressures. These results indicate the importance of CNTs treatment prior to nanocomposite fabrication in order to obtain lower percolation threshold. Obtained results are useful in development of haptic sensor, artificial finger, and brain like devices for robotics applications.

    DOI: 10.1016/j.sna.2017.09.026

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  • Diameter dependence of longitudinal unzipping of single-walled carbon nanotube to obtain graphene nanoribbon 査読有り

    Fukumori M., Pandey R., Fujiwara T., TermehYousefi A., Negishi R., Kobayashi Y., Tanaka H., Ogawa T.

    Japanese Journal of Applied Physics   56 ( 6 )   2017年06月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2017 The Japan Society of Applied Physics. Graphene nanoribbons (GNRs) were successfully synthesized by the longitudinal unzipping of a single-walled carbon nanotube (SWNT). In this process, a short-duration sonication was performed to unzip the SWNT. The obtained results clearly show that the synthesized GNR is semiconducting. Furthermore, it is also confirmed by Raman spectroscopy that the time variation of the samples during the unzipping process has two types of reaction, namely, fast and slow. Furthermore, the obtained results confirm that the narrower SWNT should be unzipped quickly, whereas the wider SWNT should be unzipped slowly.

    DOI: 10.7567/JJAP.56.06GG12

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  • Chirality dependence of Longitudinal Unzipping of Single-Walled Carbon Nanotube to obtain Graphene Nanoribbon 査読有り

    M. Fukumori, R. R. Pandey, T. Fujiwara, A. TermehYousefi, R. Negishi, Y. Kobayashi, H. Tanaka, T. Ogawa

    Jpn. J. Appl. Phys.   56   06GG02   2017年05月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1088/1361-6528/aa6567/meta

  • Synthesis of very narrow multilayer graphene nanoribbon with turbostratic stacking 査読有り

    R. Negishi, K. Yamanoto, H. Kitakawa, M. Fukumori, H. Tanaka , T. Ogawa, Y. Kobayashi

    Appl. Phys. Lett.   110   201901   2017年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1063/1.4983349

  • Development of Haptic Based Piezoresistive Artificial Fingertip for Maturity Analysis of Tomato via functionalzed carbon nanotubes 査読有り

    A. TermehYousefi, S. Azhari, A. Khajeh, M. N. Hamidon, H. Tanaka

    Mater. Sci. Eng. C   77   1098 - 1103   2017年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1016/j.msec.2017.04.040

  • Tuning the electrical property of single layer graphene nanoribbon by adsorption of planar molecular nanoparticles 査読有り

    R. R. Pandey, M. Fukumori, A. TermehYousef, M. Eguchi, D. Tanaka, T. Ogawa, H. Tanaka

    Nanotechnology   28   175704   2017年04月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1088/1361-6528/aa6567

  • Enhancement of glucose oxide electron-transfer mechanism in glucose biosensor via optimum physical chemistry of functionalized carbon nanotubes 査読有り

    Termehyousefi A., Tanaka H., Bagheri S.

    Reviews in Chemical Engineering   33 ( 2 )   201 - 215   2017年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Walter de Gruyter GmbH, Berlin/Boston.Nanostructures are a viable candidate for the construction of simple blood sugar monitoring devices. Electrochemical oxidation based on the immobilization of glucose oxidase (GOx) on carbon nanostructures has paved the way for a modern approach to the determination of glucose levels in blood. Carbon nanotubes (CNTs) exhibit excellent electrical properties, resulting in increased interest in glucose biosensors based on CNTs. Its large surface area and optimum aspect ratio increase the total amount of immobilized biomaterials onto its surface. In this contribution, recent advances in the development of reliable methods to improve the electron-transfer mechanism of GOx in CNT-based glucose biosensors are highlighted. Moreover, mass production and growth mechanism of purified CNTs by chemical vapor deposition were discussed by emphasizing its growth-control aspects.

    DOI: 10.1515/revce-2015-0051

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  • 次世代ナノ配線を志向したグラフェンナノリボン作製と電気特性制御

    田中啓文

    ナノ学会会報   16 ( 2 )   55 - 59   2017年02月

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    担当区分:責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)

  • 次世代ナノ配線を志向したグラフェンナノリボン作製と電気特性制御 査読有り

    田中 啓文

    ナノ学会会報   16   55 - 59   2017年01月

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    担当区分:筆頭著者, 最終著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)

    CiNii Article

    CiNii Research

  • 真空分子スプレーによる基板へのグラフェンナノリボン吸着

    安藤 紗絵子, 稲見 栄一, 田中 啓文, 山田 豊和

    表面科学学術講演会要旨集 ( 公益社団法人 日本表面真空学会 )   37 ( 0 )   118   2017年01月

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    記述言語:日本語   掲載種別:研究論文(研究会,シンポジウム資料等)

    <br><br>我々は自作超高真空STM装置を用いカーボンナノチューブをアンジップし得たグラフェンナノリボン(GNR)の研究を行っている。GNR溶液をAu基板上に大気中で滴下し真空槽内にて加熱した。この手法では溶媒の不純物吸着による汚染は避けられない。そこで新たに上記装置に真空分子スプレーを自作し取り付けた。溶媒を真空中に拡散する事で、GNRのみを基板上に吸着できる。詳細を報告する。

    DOI: 10.14886/sssj2008.37.0_118

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    CiNii Research

  • Spike-based time-domain weighted-sum calculation using nanodevices for low power operation 査読有り

    Morie T., Liang H., Tohara T., Tanaka H., Igarashi M., Samukawa S., Endo K., Takahashi Y.

    16th International Conference on Nanotechnology - IEEE NANO 2016   390 - 392   2016年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2016 IEEE.This paper introduces a time-domain weighted-sum calculation operation based on a spiking neuron model, and discusses a resistance-capacitance circuit that performs a calculation operation assumed to be realized in CMOS VLSI technology. A nanodevice that executes this calculation is also presented. The calculation circuit is useful for extremely low power operation. This operation uses the rising slopes of post-synaptic potentials triggered by input spike pulses. In the time-domain calculation circuit, the energy dissipation is independent of the resistance, and only depends on the capacitance and voltages. However, the time constant, which is the product of the resistance and capacitance, should be relatively large to guarantee the calculation resolution, and therefore the resistance should be at the giga-ohms levels. The nanodevice consists of a nanodisk array connected with a fin field-effect transistor. Nanodisk arrays can be fabricated using a self-assembly bio-nano-template technique, and they act as resistors with resistance levels of several giga-ohms. A weighted sum can be achieved with an energy dissipation on the order of 1 fJ, with a number of inputs that can be more than 100. This amount of energy is several orders of magnitude lower than that of conventional digital processors.

    DOI: 10.1109/NANO.2016.7751490

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  • Progress on nanoparticle-based carbon nanotube complex: fabrication and potential application 査読有り

    A. TermehYousefi, M. Fukumori, R. R. Pandey, P. Liu, L. Fu, S. Bagheri, H. Tanaka

    Rev. Inorg. Chem.   4   183 - 201   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1515/revic-2016-0004

  • Enhancement of Glucose Oxides Electron Transfer mechanism in Glucose Biosensor via Optimum Physical Chemistry of Functionalized Carbon Nanotubes 査読有り

    A. TermeYousefi, S. Bagheri, H. Tanaka

    Reviews in Chemical Engineering   33 ( 2 )   2016年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • ナノ粒子吸着による単層グラフェンナノリボンの半導体化

    田中啓文

    マテリアルステージ   15 ( 11 )   67 - 69   2016年02月

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    担当区分:責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)

  • Co-Adsorption of TbIII-Porphyrin Double-Decker Single-Molecule Magnets in a Porous Molecular Network: Toward Controlled Alignment of Single-Molecule Magnets on a Carbon Surface 査読有り

    T.Inose, D.Tanaka, O.Ivasenko, K.Tahara, S.De Feyter, Y.Tobe, H.Tanaka, T.Ogawa

    Chem. Lett.   2016年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1246/cl.151040

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    CiNii Article

  • High Efficiency Platform for Biosensors Based On Optimum Physical Chemistry of Carbon Nanotubes 査読有り

    A. T. Yousefi, S. Ikeda, M. R. Mahmood, M. Miyake, H. Tanaka

    Chem. Vap. Deposition   2016年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • Correlation of Critical Parameters on Carbon Nanotubes Crystallinity in Chemical Vapor Deposition by using Renewable Bioresource 査読有り

    A. TermehYousefi, H. Tanaka, S. Bagheri, M. R. Mahmood, S. Ikeda

    J. Nanosci. Nanotechnol.   2016年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1166/jnn.2016.11648

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  • Effect of Protonation on the Single-Molecule-Magnet Behavior of a Mixed (Phthalocyaninato)(porphyrinato) Terbium Double-Decker Complex 査読有り

    D. Tanaka, N. Sumitani, T. Inose, H. Tanaka, N. Ishikawa, T. Ogawa

    Chem. Lett.   2016年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1246/cl.150034

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    CiNii Article

  • Functionality emergence of single molecule electronics 査読有り

    Ogawa T., Handayani M., Inose T., Tamaki T., Fukumori M., Miyamoto F., Tanaka H.

    IEEE CPMT Symposium Japan 2015: Packaging is Everywhere, ICSJ 2015   134 - 135   2015年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    © 2015 IEEE.In these decades organic functional materials have been utilized in daily electronic products like organic light emitting diodes or liquid crystals in cellar phones or televisions. At the present stage organic materials are used as mass materials and the most characteristic properties of them arise from cooperative effects of each molecule. However, if each single molecule has their own specific properties and cooperate in a rational way with each other, they should emerge more sophisticated properties. In this regard, we have been studying electronic or magnetic properties of single or small number of molecules, synthetic route for molecular integrated circuits by a successive coupling of the molecular parts, by self-assembling on surface, and combination with carbon nano-materials. In order to emerge new properties, each molecule units should show non-linear and non-symmetric responses. We have been studying design, synthesis, and measurements of organic molecules which can exhibit such responses in single molecules.

    DOI: 10.1109/ICSJ.2015.7357378

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  • Possible High Efficiency Platform for Biosensors Based on Optimum Physical Chemistry of Carbon Nanotubes 査読有り

    Yousefi A., Tanaka H., Bagheri S., Kadri N., Ikeda S., Mahmood M., Miyake M.

    Chemical Vapor Deposition   21 ( 10-12 )   263 - 266   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.Carbon nanotube (CNT)-based electrochemical biosensors are used to determine the concentration of analytes by measuring mass, heat, or oxygen. CNTs, as an immobilizing platform of biomaterials, play an important role in enhancing the electron transfer mechanism of a biosensor. The large surface area and optimum aspect ratio (length to thickness) of CNTs maximize the amount of immobilized biomaterials on the surface. In this study, various aspect ratios of CNTs are reported, based on the alteration of growth mechanisms using CVD. The growth-dependent and -independent parameters of the CNT arrays are studied as functions of the synthesis method. Full Paper: Different aspect ratios of CNTs are reported based on the alteration of growth temperature which may be a useful method of increasing the electron-relaying capacity of enzymatic biosensors due to the presence of the insulating, bulky enzyme molecules. Nanotubes are grown perpendicular to the surface of the silicon substrate in different aspect ratios according to the applied growth temperatures.

    DOI: 10.1002/cvde.201507184

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  • Erratum:: Method for Controlling Electrical Properties of Single-Layer Graphene Nanoribbons via Adsorbed Planar Molecular Nanoparticles (Scientific Reports (2015) 5:12341 DOI: 10.1038/srep12341)) 査読有り

    Tanaka H., Arima R., Fukumori M., Tanaka D., Negishi R., Kobayashi Y., Kasai S., Kazu Yamada T., Ogawa T.

    Scientific Reports   5   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1038/srep14399

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  • Vectorial Crystal Growth of Oriented Vertically Aligned Carbon Nanotubes Using Statistical Analysis 査読有り

    Yousefi A., Tanaka H., Bagheri S., Elfghi F., Mahmood M., Ikeda S.

    Crystal Growth and Design   15 ( 7 )   3457 - 3463   2015年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2015 American Chemical Society.In this present work, crystalline growth conditions of oriented carbon nanotubes based on chemical vapor deposition (CVD) were optimized. The crystallinity and degree of alignment of the grown carbon nanotubes (CNTs) were characterized by field emission scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The effects of four variables, namely, deposition time, deposition temperature, annealing process, and concentration of the precursor on the crystallinity of the CNTs, were explored. Furthermore, the correlation of parameters with the growth mechanism was examined using response surface methodology in an attempt to determine the complex interactions between the variables. A total of 30 runs, including predicting and consolidation runs to confirm the results, were required for screening the effect of the parameters on the growth of the CNTs. On the basis of the investigated model, it was found that the crystallinity of the CNTs grown by the CVD method can be controlled via restriction of the effective parameters. (Graph Presented).

    DOI: 10.1021/acs.cgd.5b00534

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  • Vectorial Crystal Growth of Oriented Vertically Aligned Carbon Nanotubes using statistical analysis 査読有り

    A. TermehYousefi, H. Tanaka, S. Bagheri, F. Elfghi, M. Rusop, S. Ikeda

    Crystal Growth & Design   15   3457 - 3463   2015年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

  • Switching of single-molecule magnetic properties of Tb<sup>III</sup>- porphyrin double-decker complexes and observation of their supramolecular structures on a carbon surface 査読有り

    Inose T., Tanaka D., Tanaka H., Tanaka H., Ivasenko O., Nagata T., Nagata T., Ohta Y., De Feyter S., Ishikawa N., Ogawa T.

    Chemistry - A European Journal   20 ( 36 )   11362 - 11369   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Double-decker complexes based on single-molecule magnets (SMMs) are a class of highly promising molecules for applications in molecular spintronics, wherein control of both the ligand oxidative states and the 2D supramolecular structure on carbon materials is of great importance. This study focuses on the synthesis and study of 2,3,7,8,12,13,17,18-octaethylporphyrin (OEP)-Tb III double-decker complexes with different electronic structures comprising protonated, anionic, and radical forms. Magnetic susceptibility measurements revealed that only the anionic and radical forms of the OEP-Tb III double-decker complexes exhibited SMM properties. The barrier heights for magnetic moment reversal were estimated to be 207 and 215 cm -1 for the anionic and radical forms, respectively. Scanning tunneling microscopy (STM) investigations revealed that these OEP-Tb III complexes form well-ordered monolayers upon simple dropcasting from dilute dichloromethane solutions. All three complexes form an isomorphic pseudo-hexagonal 2D pattern, regardless of the differences in the electronic structures of their porphyrin-Tb cores. This finding is of interest for SMM technology as ultrathin films of these materials undergoing chemical transformations will not require any detrimental reorganization. Finally, we demonstrate self-assembly of the protonated 5,15-bisdodecylporphyrin (BDP)-TbIII double-decker complex as an example of successful supramolecular design to achieve controlled alignment of SMM-active sites. Switch it up! By synthesizing octaethylporphyrin (OEP)-TbIII double-decker complexes with different electronic structures (protonated, anionic, and radical forms), the on/off switching of the single-molecule magnets (SMMs) could be achieved. Stable 2D structures of each molecule were also observed by scanning tunneling microscopy (STM). © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/chem.201402669

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  • Erratum: Large rectification effect achieved by a combination of carbon nanotube junction and molecule-carbon nanotube interface (Applied Physics Express (2012) 5 (115102)) 査読有り

    Hong L., Tanaka H., Ogawa T.

    Applied Physics Express   5 ( 12 )   2012年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    DOI: 10.1143/APEX.5.129201

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  • Fabrication of nanogap electrodes by the molecular lithography technique 査読有り

    Nishino T., Nishino T., Negishi R., Tanaka H., Ogawa T., Ishibashi K., Ishibashi K.

    Japanese Journal of Applied Physics   50 ( 3 )   2011年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We have developed fabrication processes of nanogap electrodes with various metals, by combining the molecular lithography technique, in which self-assembled molecular (SAM) layers with an accurately defined thickness are used for resist, and the electron beam lithography. Until now, the molecular lithography technique has been applied to Au and Pt to fabricate the nanogap electrodes, because a thiol-group of the termini molecule that the SAM resist contains is easily stuck to these metals. In this work, we have extended the technique to various metals on which the SAM layers is hard to be formed, with the help of the X-ray photoelectron spectroscopy (XPS) to obtain information on adhesion conditions of the SAM layers on the metals. Finally, we demonstrate fabrication of the Nb nanogap electrodes with the developed technique. An Au nanoparticle was embedded in between the nanogap, which showed the Coulomb blockade effect and the superconducting gap in the current-voltage curves. © 2011 The Japan Society of Applied Physics.

    DOI: 10.1143/JJAP.50.035204

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  • Preparation of organic nanoscrews from simple porphyrin derivatives 査読有り

    Ozawa H., Tanaka H., Kawao M., Uno S., Nakazato K.

    Chemical Communications   ( 47 )   7411 - 7413   2009年12月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Twisted supramolecular assemblies "nanoscrews", were prepared by using simple porphyrin derivatives and acetonitrile solvent. The electrical properties of the assemblies were measured by using microgap electrodes. The nanoscrew had conductivity and showed photo-current. By changing the solvent, the pitch of the screws and their aggregation shapes could be controlled. © 2009 The Royal Society of Chemistry.

    DOI: 10.1039/b915832d

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  • A photo-responsive molecular wire composed of a porphyrin polymer and a fullerene derivative 査読有り

    Ozawa H., Kawao M., Uno S., Nakazato K., Tanaka H., Ogawa T.

    Journal of Materials Chemistry   19 ( 44 )   8307 - 8313   2009年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Dendron-protected porphyrin polymers (Mn ∼ 43000 g mol -1; Mw ∼ 111000 g mol-1) were deposited using the Langmuir-Blodgett method on glass surfaces modified with N-phenyl-3-aminopropyltriethoxysilane. These deposited films were soaked in a solution of a fullerene derivative bearing a pyridinyl moiety. Topographical images of the surface obtained by atomic force microscopy showed that the height of the porphyrin polymers was 3.1 ± 0.5 nm as deposited, and clearly increased to 3.9 ± 0.3 nm upon soaking. The increase in height (about 0.8 nm) corresponded to the diameter of the fullerene, indicating that the pyridinyl moieties of the fullerene molecules bound to the zinc atoms of the porphyrin units. Porphyrin polymers having thiol groups at both ends bridging nano-gapped gold electrodes were fabricated on silicon chips. The chips were soaked in the fullerene derivative solution to make devices containing porphyrin polymers whose central zinc atoms were coordinated by the fullerene derivative. The current-voltage (I-V) characteristics of these devices were measured, and higher conductivity was observed during photoirradiation only when the devices contained both the porphyrin polymer and the fullerene derivative; no photo-response was observed when either component was absent. © 2009 The Royal Society of Chemistry.

    DOI: 10.1039/b910638c

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  • Preparation of long conjugated porphyrin polymers with gold nanopartieles at both ends as electronic and/or photonic molecular wires 査読有り

    Ozawa H., Kawao M., Tanaka H., Ogawa T.

    Chemistry Letters   38 ( 6 )   542 - 543   2009年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Nanocomposites of long conjugated porphyrin polymers with both ends substituted by gold nanoparticles were prepared by mixing a polymer bearing thiol groups at both ends with gold nanoparticles protected by 2-methylundecane-2-thiol. The nanocomposites were observed by atomic force microscopy (AFM), which showed that the gold nanopartieles were attached at the terminal positions of the porphyrin polymers as expected from height analyses. The height at the terminal position was ca. 3-4 nm and that at the center position was ca. 2nm. The nanocomposites could be dispersed homogeneously on solid surfaces such as HOPG or glass substrates using a pulse injection method under high vacuum. Copyright © 2009 The Chemical Society of Japan.

    DOI: 10.1246/cl.2009.542

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  • Spectral, structural, and computational studies of a new family of ruthcnium(II) Complexes containing substituted 1,10-phenanthroline ligands and in situ electropolymerization of a phenanthroIineruthenium(II) complex Bridging nanogap gold electrodes 査読有り

    Huang W., Wang L., Tanaka H., Ogawa T.

    European Journal of Inorganic Chemistry   ( 10 )   1321 - 1330   2009年04月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The synthesis and spectral and structural characterization of a new family of ruthenium(II) complexes containing 3-bromo-, 3,8-dibromo-, 3-(thiophen-2′, 2″ -yl) -, and 3,8-(thio-phen-2′,2″-yl)- l,10-phenanthroline (phen) ligands is described. UV/Vis spectroscopy is used to compare the differences between the conjugated π systems in these ligands and their respective [Ru(bpy)2]2+ (bpy = 2,2′- bipyridine) analogs. Density functional theory (DFT) computations have been carried out to compare the energy differences between the sin gle-crystal and the energy-minimized structures for different conformations (trans/trans, trans/cis and cis/cis) of the thiophene rings and their bonded phen ring. The formation of an oligothiophene semiconductor polymer bridging gold electrodes with a gap of around 25 nm gap from RuII complex 7 by in situ electropolymerization, and its removal, is monitored by scanning electron microscopy (SEM). © Wiley-VCH Verlag GmbH & Co. KGaA.

    DOI: 10.1002/ejic.200801131

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  • Vertical alignment of single-walled carbon nanotube films formed by electrophoretic deposition 査読有り

    Kim S., Lee H., Tanaka H., Weiss P.

    Langmuir   24 ( 22 )   12936 - 12942   2008年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Films of chemically shortened and functionalized single-walled carbon nanotubes (SWNTs) have been formed on a gold electrode by electrophoretic deposition. Applying ultrasonic energy resulted in dramatic changes of the film morphology; the deposited SWNT bundles reassembled and oriented normal to the electrode. Oriented SWNT bundles with high density (more than 250 bundles/μm2) not only presented narrow size distributions, but uniformly spread on the electrode. We discuss the mechanism of SWNT orientation by analyzing the variation in the film morphology with ultrasonication time. In addition, we suggest that the 3D displays of AFM images can lead to misjudgment of nanotube alignment. The method for aligning SWNTs normal to the electrode may be competitive with chemical vapor deposition or screen printing, the predominant methods by which vertically aligned SWNT films have been fabricated to date. © 2008 American Chemical Society.

    DOI: 10.1021/la802266y

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  • Effects of metal-ion complexation for the self-assembled nanocomposite films composed of gold nanoparticles and 3,8-bis(terthiophenyl)phenanthroline- based dithiols bridging 1 μm gap gold electrodes: Morphology, temperature dependent electronic conduction, and photoresponse 査読有り

    Huang W., Tanaka H., Ogawa T.

    Journal of Physical Chemistry C   112 ( 30 )   11513 - 11526   2008年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    3,8-Bis(3′4′-dibutyl-5″-mercapto-2,2′: 5′2″-termiophen-5-yl)-1,10-phenanthroline (2) with a molecular length of 3.36 nm and its Ru(II), Fe(II), and Cu(II) complexes were treated with tert-dodecanethiol-protected active gold nanoparticles (Au-NPs) in an average size of 3.3 nm in the presence of two facing Au electrodes with a 1 × 1 μm2 gap. Stable self-assembled molecular junctions were produced, wherein dithiols-bridged AuNPs were chemisorbed to the electrodes by means of Au-S-bonded contacts. SEM and AFM micrographs showed that different morphologies of the films were formed depending on the number of ligand 2 in the molecules and the coordination configurations of transition metal ions. Among them a relatively homogeneous granular thin film was obtained successfully in the case of the [Ru(bpy)2]2+ complex. Temperature-dependent current-voltage measurements for these junctions were performed in the temperature range of 8-300 K. The electronic conduction is dominated by the sum of tunneling and thermal excitation. Classical Arrhenius plots and their linear fits, wherein the temperature-independent tunneling current was deducted, were obtained to determine the average activation energies of these nanodevices. Photoresponsive properties of these self-assembled films were studied at different temperature (80, 160, and 300 K, respectively), where reversible and reproducible photoresponse can be recorded at room temperature in the presence of [Ru(bpy)2]2+ species. The comparison of results before and after metal-ion complexation reveals that the introduction of Ru(II) ion into the metal-molecule system can improve effectively the morphology of the self-assembled films and the overall conductivity, decrease the barrier for activation energy, and enhance the photoresponse of these nanodevices. © 2008 American Chemical Society.

    DOI: 10.1021/jp711635p

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  • A new utilization of organic molecules for nanofabrication using the molecular ruler method 査読有り

    Hino T., Tanaka H., Ozawa H., Iida Y., Ogawa T.

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   313-314   369 - 372   2008年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Oligothiophenes and porphyrin oligomers were exploited as new molecules for the "molecular ruler" (MR) method in the form of simple molecular monolayers. When handled in air, oligothiophenes yielded extremely homogeneous nanogaps about 30 nm wide, while handling under N2 produced nanoscale gaps of around 10 nm between parent and daughter structures. The difference between these two results indicated that it was possible to control the width of this gap by varying the extent of oxidation of the oligothiophenes. Porphyrin oligomers also yielded nanogaps about 10 nm wide. Therefore, these two types of molecules are promising candidates for use in the MR methods. © 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfa.2007.05.045

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  • Scanning tunneling microscopy investigation of vanadyl and cobalt(II) octaethylporphyrin self-assembled monolayer arrays on graphite 査読有り

    Miyake Y., Tanaka H., Ogawa T.

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   313-314   230 - 233   2008年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Two-dimensional crystals of [2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine] vanadium(IV) oxide and cobalt(II) (VOOEP and CoOEP, respectively) at the interface of 1-tetradecene and highly oriented pyretic graphite (HOPG) were studied by scanning tunneling microscopy (STM). The lattice parameters were determined for VOOEP (a = 1.61 ± 0.1 nm, b = 1.46 ± 0.05 nm, Γ = 61 ± 3°) and CoOEP (a = 1.48 ± 0.08 nm, b = 1.42 ± 0.07 nm, Γ = 62.0 ± 4°), which were calibrated using the HOPG lattice as a reference. The center metal dependence observed by high-resolution STM analysis of octaethylporphyrin and the differences between VOOEP and CoOEP are proved. © 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfa.2007.05.073

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  • Syntheses, crystal structures, and spectral properties of a series of 3,8-bisphenyl-1,10-phenanthroline derivatives: Precursors of 3,8-bis(4-mercaptophenyl)-1,10-phenanthroline and its ruthenium(II) complex for preparing nanocomposite junctions with gold nanoparticles between 1 μm gap gold electrodes 査読有り

    Huang W., Masuda G., Maeda S., Tanaka H., Hino T., Ogawa T.

    Inorganic Chemistry   47 ( 2 )   468 - 480   2008年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A multistep synthesis was achieved to obtain 3,8-bis(4-mercaptophenyl)-1, 10-phenanthroline, which has two free thiol end groups with a molecular length of 1.89 nm, and its ruthenium(II) complex. Five single-crystal structures and UV-vis spectra of related intermediates in methanol and the solid state were studied in order to obtain additional information on the molecules as well as on the supramolecular interactions in the structures. Thermal and electrochemical properties of related Ru(II) complexes were also involved. 3,8-Bis(4- mercaptophenyl)-1,10-phenanthroline and one of its ruthenium(II) complexes were then treated with gold nanoparticles (Au-NPs) via in situ thiol-to-thiol ligand exchange in the presence of two facing Au electrodes with a 1 x 1 μm 2 gap. Stable molecular junctions composed of self-assembled films were produced as revealed by an obvious increase of the conductivity between the Au electrodes, wherein dithiols-bridged Au-NPs were attached to the electrodes by means of Au-S-bonded contacts. Temperature-dependent current-voltage (I-V) measurements for the junctions were performed in the temperature range of 7-300 K, and classical Arrhenius plots and their linear fits were obtained to determine the average activation energies (ΔE) of these devices. It is found that when the Ru(II) ion is introduced, the conductivity of the nanodevice is increased and the energy barrier is lowered under the same experimental conditions. © 2008 American Chemical Society.

    DOI: 10.1021/ic701295q

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  • Observation of single electron effect of the Au nanoparticles using hybrid type nanofabrication technique 査読有り

    Negishi R., Tanaka H.

    Journal of the Vacuum Society of Japan   51 ( 7 )   428 - 432   2008年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    We would like to share our recent results from a research on the single electron tunneling effect in a double-barrier tunneling junction (DBTJ) structure. Single Au nanoparticles were trapped in a nanogap electrodes, whose gap size was precisely controlled using a combination of electron beam lithography and molecular ruler technique. Here, we introduce how the novel combination technique was utilized to obtain the nanogap electrode. We also introduce the size effect of Au particles on the single electron tunneling behavior as a Coulomb island. Finally, we introduce the relation between the geometrical and electrical properties of the DBTJ.

    DOI: 10.3131/jvsj2.51.428

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  • Size-dependent single electron tunneling effect in Au nanoparticles 査読有り

    Negishi R., Hasegawa T., Tanaka H., Terabe K., Ozawa H., Ogawa T., Aono M.

    Surface Science   601 ( 18 )   3907 - 3911   2007年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We investigated single electron tunneling (SET) behavior of dodecanethiol-coated Au nanoparticles of two different sizes (average sizes are 5 nm and 2 nm) using nanogap electrodes, which have a well-defined gap size, at various temperatures. The Coulomb staircases and the Coulomb gap near-zero bias voltage caused by the suppression of the tunneling electrons due to the Coulomb blockade effect were observed in the current-voltage (I-V) curves of both sizes of nanoparticles at a low temperature (10 K). At room temperature, the Coulomb gap was observed only in the I-V curve of the smaller nanoparticles. This result indicates that the charging energy of the smaller nanoparticles is enough to overcome the thermal energy at room temperature. This suggests that it is possible to operate the SET devices at room temperature using the smaller nanoparticles as a Coulomb island. © 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.susc.2007.04.039

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  • Photo-response behavior of Au nano-particle/porphyrin polymer composite device with nano-gapped electrodes 査読有り

    Ogawa T., Ozawa H., Kawao M., Tanaka H.

    Journal of Materials Science: Materials in Electronics   18 ( 9 )   939 - 942   2007年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Electrodes with a gap size of 15 ∼ 80 nm could be bridged by porphyrin molecular wires with 50 ∼ 300 nm length. The porphyrin units could be coordinated with Au nano-particles having pyridinyl moiety. The device with both the porphyrin and Au nano-particles showed photo-response characteristics while those without the Au nano-particles showed no response. © Springer Science+Business Media, LLC 2007.

    DOI: 10.1007/s10854-007-9262-0

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  • I-V characteristics of single electron tunneling from symmetric and asymmetric double-barrier tunneling junctions 査読有り

    Negishi R., Hasegawa T., Terabe K., Aono M., Tanaka H., Ogawa T., Ozawa H.

    Applied Physics Letters   90 ( 22 )   2007年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    I-V characteristics of single electron tunneling from a symmetric and an asymmetric double-barrier tunneling junction (DBTJ) were examined. A single Au nanoparticle was trapped in nanogap whose size was precisely controlled using a combination of electron beam lithography and molecular ruler technique. Though the symmetric junction showed a monotonic rise with a bias beyond the Coulomb gap voltage, the asymmetric junction showed Coulomb staircases. The capacitance of the junction estimated from the fitting curves using the Coulomb conventional theory was consistent with the capacitance calculated from the observed structure. The authors quantitatively found the correlation between the electrical and structural properties of DBTJ. © 2007 American Institute of Physics.

    DOI: 10.1063/1.2745252

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  • Synthesis of dendron-protected porphyrin wires and preparation of a one-dimensional assembly of gold nanoparticles chemically linked to the π-conjugated wires 査読有り

    Ozawa H., Kawao M., Tanaka H., Ogawa T.

    Langmuir   23 ( 11 )   6365 - 6371   2007年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    A one-dimensional assembly of gold nanoparticles chemically bonded to jπ-conjugated porphyrin polymers was prepared on a chemically modified glass surface and on an undoped naturally oxidized silicon surface by the following methods: π-conjugated porphyrin polymers were prepared by oxidative coupling of 5,15-diethynyl-10,20-bis-((4-dendron)phenyl) porphyrin (6), and its homologues (larger than 40-mer) were collected by analytical gel permeation chromatography (GPC). The porphyrin polymers (>40-mer) were deposited using the Langmuir-Blodgett (LB) method on substrate surfaces, which were then soaked in a solution of gold nanoparticles (2.7 ±0.8 nm) protected with t-dodecanethiol and 4-pyridineethanethiol. The topographical images of the surface observed by tapping mode atomic force microscopy (AFM) showed that the polymers could be dispersed on both substrates, with a height of 2.8 ± 0.5 nm on the modified glass and 3.1 ± 0.5 nm on silicon. The height clearly increased after soaking in the gold nanoparticle solution, to 5.3 ± 0.5 nm on glass and 5.4 ± 0.7 nm on silicon. The differences in height (2.5 nm on glass and 2.3 nm on silicon) corresponded to the diameter of the gold nanoparticles bonded to the porphyrin polymers. The distance between gold nanoparticles observed in scanning electron microscopic images was ca. 5 nm, indicating that they were bonded at every four or five porphyrin units. © 2007 American Chemical Society.

    DOI: 10.1021/la0634544

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  • Refinement of conditions of point-contact current imaging atomic force microscopy for molecular-scale conduction measurements 査読有り

    Yajima T., Tanaka H., Matsumoto T., Otsuka Y., Sugawara Y., Ogawa T.

    Nanotechnology   18 ( 9 )   2007年03月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    We have refined the measurement conditions of point-contact current imaging microscopy (PCI-AFM) to measure the electric properties along the long axes of one-dimensional structures. Using this refinement, the current image of the PCI-AFM can be used to distinguish individual single-walled carbon nanotubes in a bundled structure. The PCI-AFM will thus help further developments in nanoscience for conduction measurements in one-dimensional structures. © IOP Publishing Ltd.

    DOI: 10.1088/0957-4484/18/9/095501

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  • A method for the fabrication of sculptured thin films of periodic arrays of standing nanorods 査読有り

    Tanaka H., Horn M., Weiss P.

    Journal of Nanoscience and Nanotechnology   6 ( 12 )   3799 - 3802   2006年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    A simple method for the fabrication of sculptured thin films (STFs) of periodic arrays of high-aspect-ratio (20:1) standing nanorods on silicon substrates is described. It is based on oblique evaporation onto periodically arranged arrays of "mini-rod" topography using a rotating sample stage. 1 Recently, it has been shown that these nanostructures can be prepared on relatively large areas and at low cost, making the method suitable for technological applications. 2 Copyright © 2006 American Scientific Publishers All rights reserved.

    DOI: 10.1166/jnn.2006.616

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  • Formation of supramolecular porphyrin polymers in the solution and on the surface 査読有り

    Sato H., Tsutsumi O., Takeda K., Tanaka H., Ozawa H., Kawao M., Ogawa T.

    Polymer Preprints, Japan   55 ( 2 )   2006年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    We report the first example of the isolated single chains of supramolecular porphyrin polymer, consisting of novel porphyrin dimer and bidentate ligand. In order to fabricate the isolated single chains on surface, the formation of supramolecular polymers was conducted at the air/water interface using a surfactant, and the transcription of these was performed by Langmuir-Blodgett method. A surfactant assisted the elongation of individual single chains, resulting in micrometer-long supramolecular polymers with molecularly uniform height on surface.

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  • Fabrication of periodic standing rod arrays by the shadow cone method 査読有り

    Tanaka H., Weiss P., Horn M.

    International Journal of Nanoscience   5 ( 6 )   815 - 819   2006年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    A simple method for fabricating periodic arrays of high aspect ratio (1:20) standing nanorods on silicon substrates is described. It is based on shadow deposition onto periodically arranged arrays of mini-rods on a rotating sample stage. Consequently, such nanostructures can be prepared on relatively large areas and at low cost, making the method suitable for industrial applications. © World Scientific Publishing Company.

    DOI: 10.1142/S0219581X06005200

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  • Morphology and electric properties of nonathiophene/Au nano-composite thin films formed between 1 μm gapped electrodes 査読有り

    Ogawa T., Huang W., Tanaka H.

    Molecular Crystals and Liquid Crystals   455 ( 1 )   305 - 309   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    A nano-composite conductive film is formed between gold electrodes by immersion of the electrode pair in a chloroform solution of nonathiophenedithiol and gold nanoparticles. The homogeneous thin film is formed over an area of 3 mm × 3 mm surrounding the 1 m-gapped electrodes. The thickness of the film (20 nm) corresponds to 2-3 layers of the dithiol-bridged Au nanoparticles. Temperature-dependent I-V curves reveal that a thermionic mechanism dominates in the high-temperature region (80 K), while molecular tunneling is the main transport process at lower temperatures.

    DOI: 10.1080/15421400600698774

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  • Electronic properties of a single-walled carbon nanotube/150mer-porphyrin system measured by point-contact current imaging atomic force microscopy 査読有り

    Tanaka H., Yajima T., Kawao M., Ogawa T.

    Journal of Nanoscience and Nanotechnology   6 ( 6 )   1644 - 1648   2006年06月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The electronic properties of a single-walled carbon nanotube/150mer of porphyrin polymer wire system were investigated. Current-voltage (I-V) curves were measured simultaneously along with topographic observations using point-contact current imaging atomic force microscopy. Symmetric I-V curves were obtained at bare single-walled carbon nanotubes but characteristic asymmetrical rectifying behavior was found at the single-walled carbon nanotube/150mer- porphyrin junctions. This finding is of key importance for the development of new nanoscale molecular electronic devices. Copyright © 2006 American Scientific Publishers All rights reserved.

    DOI: 10.1166/jnn.2006.246

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  • Fabrication of nanoscale gaps using a combination of self-assembled molecular and electron beam lithographic techniques 査読有り

    Negishi R., Hasegawa T., Terabe K., Aono M., Ebihara T., Tanaka H., Ogawa T.

    Applied Physics Letters   88 ( 22 )   2006年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    We have developed and tested a new method of fabricating nanogaps using a combination of self-assembled molecular and electron beam lithographic techniques. The method enables us to control the gap size with an accuracy of approximately 2 nm and designate the positions where the nanogaps should be formed with high-resolution patterning by using electron beam lithography. We have demonstrated the utility of the fabricated nanogaps by measuring a single electron tunneling phenomenon through dodecanethiol-coated Au nanoparticles placed in the fabricated nanogap. © 2006 American Institute of Physics.

    DOI: 10.1063/1.2209208

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  • Synthesis of end-functionalized π-conjugated porphyrin oligomers 査読有り

    Ozawa H., Kawao M., Tanaka H., Ogawa T.

    Tetrahedron   62 ( 20 )   4749 - 4755   2006年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    4-(S-Acetylthiomethyl)phenyl- and pyrenyl-functionalized π-conjugated porphyrin oligomers were synthesized. The distribution of the length of the oligomers could be controlled by changing the ratio of the starting porphyrin to the capping molecules. Oligomers from dimers to heptamers were isolated using size exclusion chromatography. The spectroscopic properties of these oligomers were measured to determine the influences of the number of porphyrin units and capping molecules on the absorption and emission spectra. © 2006 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.tet.2006.03.031

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  • Simple preparation method for supramolecular porphyrin arrays on mica using air-water interface 査読有り

    Sato H., Tsutsumi O., Takeda K., Tanaka H., Ogawa T.

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers   45 ( 3 B )   2324 - 2327   2006年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The fabrication of supramolecular porphyrin arrays on the surface of a mica substrate is demonstrated. The supramolecular structures are prepared at the air-water interface from a dilute solution of porphyrin dimer and bidentate ligand and then transferred to mica by using the conventional Langmuir-Blodgett method. Isolated wire-like structures and networks of structures are observed by atomic force microscopy. From the analysis of the height histogram and width, these structures are considered to be side-by-side arrangements of supramolecular chains of porphyrin dimer and bidentate ligand. By changing the ligand molecule, we demonstrate that the configuration of the supramolecular structure can be controlled. © 2006 The Japan Society of Applied Physics.

    DOI: 10.1143/JJAP.45.2324

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  • Synthesis and self-assembly of novel porphyrin molecular wires 査読有り

    Kawao M., Ozawa H., Tanaka H., Ogawa T.

    Thin Solid Films   499 ( 1-2 )   23 - 28   2006年03月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    Sub-micrometer long butadiyne-linked porphyrin wires were synthesized by oxidative coupling of diethynylporphyrin. The porphyrin wires were analyzed by analytical gel permeation chromatography, absorption spectroscopy and matrix-assisted laser desorption/ionization time of flight mass spectroscopy. Observations of the wire were performed by atomic force microscopy. Self-assembled structures of the wires were observed on highly oriented pyrolytic graphite. Self-assembling features of the porphyrin wires depended on the length of the porphyrin wires and the concentration of the depositing solution. © 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2005.07.143

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  • Preparation of very reactive thiol-protected gold ianoparticles: Revisiting the Brust-Schiffrin method 査読有り

    Araki K., Mizuguchi E., Tanaka H., Ogawa T.

    Journal of Nanoscience and Nanotechnology   6 ( 3 )   708 - 712   2006年03月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The preparation and properties of tert-dodecanethiol protected gold nanoparticles amenable to very rapid surface functionalization by associative mechanism is described. The new material can be easily prepared by controlling the reaction time, because only a limited but enough number of tertdodecanethiol to stabilize the gold clusters is bond to the surface until about an hour. Accordingly, it can be isolated as a solid and handled much like the highly stabilized Brust-Schiffrin analogues, but reacted very rapidly with any molecular species containing one or multiple functional groups such as thiol, disulfide, pyridine, etc., These characteristics are ideal for the preparation of a variety of new organic-inorganic hybrid nanomaterials by coordinative self-assembly. This possibility was illustrated using meso-tetra(4-pyridyl) porphyrin, which promptly bonded to the reactive protected gold nanoparticles generating a solid that can be grown as thin films with layer-by-layer control on a suitably modified surface. Copyright © 2006 American Scientific Publishers All rights reserved.

    DOI: 10.1166/jnn.2006.079

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  • Molecular junctions composed of oligothiophene dithiol-bridged gold nanoparticles exhibiting photoresponsive properties 査読有り

    Huang W., Masuda G., Maeda S., Tanaka H., Ogawa T.

    Chemistry - A European Journal   12 ( 2 )   607 - 619   2005年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Three oligothiophene dithiols with different numbers of thiophene rings (3, 6 or 9) have been synthesized and characterized. The X-ray single crystal structures of terthiophene 2 and sexithiophene 5 are reported herein to show the exact molecular lengths, and ' to explain the difference between their UV-visible spectra arising from the different packing modes. These dithiols with different chain lengths were then treated with 2-dodecanethiol-protected active gold nanoparticles (Au-NPs) by means of in situ thiol-to-thiol ligand exchange in the presence of 1 μm gap Au electrodes. Thus the molecular junctions composed of self-assembled films were prepared, in which oligothio phene dithiol-bridged Au-NPs were attached to two electrodes by means of Au-S bonded contacts. The morphologies and current-voltage (I-V) characteristics of these films were studied by SEM and AFM approaches, which suggested that the thickness of the films (3-4 layers) varied within the size of one isolated Au-NP and typical distance-dependent semiconductor properties could be observed. Temperature dependent I-V measurements for these molecular junctions were performed in which the films served as active elements in the temperature range 6300 K ; classical Arrhenius plots and subsequent linear fits were carried out to give the activation energies (ΔE) of devices. Furthermore, preliminary studies on the photoresponsive properties of these devices were explored at 80, 160, and 300 K, respectively. Physical and photochemical mechanisms were used to explain the possible photocurrent generation processes. To the best of our knowledge, this is the first report in which oligothiophene dithiols act as bridging units to link Au-NPs. and also the first report about functionalized Au-NPs exhibiting photoresponse properties in the solid state. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/chem.200500822

    Scopus

    その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=29544438927&origin=inward

  • Position-selected molecular ruler 査読有り

    Tanaka H., Anderson M., Horn M., Weiss P.

    Japanese Journal of Applied Physics, Part 2: Letters   43 ( 7 B )   2004年07月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The molecular ruler method allows the precise control of the gap between a parent gold structure and a deposited daughter structure using a conveniently grown self-assembled molecular multilayer as a lithographic mask. However, we cannot choose a position where the gap should be placed, since the ruler attaches to all exposed gold surfaces. In this work, a convenient method of selecting the position of nanogaps by further patternine the molecular multilayer usine low-energy electron beam irradiation and piranha etchant is described.

    DOI: 10.1143/JJAP.43.L950

    Scopus

    その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=4644324544&origin=inward

  • Multi-curve fitting analysis of temperature-dependent I-V curves of poly-hexathienylphenanthroline-bridged nanogap electrodes 査読有り

    Araki K., Endo H., Tanaka H., Ogawa T.

    Japanese Journal of Applied Physics, Part 2: Letters   43 ( 5 A )   2004年05月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Stable junctions were obtained by preparing polymeric hexathienylphenanthroline wires coordinated to [RuII(bpy) 2](PF6)2 groups directly in Au electrode nanogaps by electropolymerization. Reproducible nonlinear and strongly temperature-dependent curves, similar to those found for self-assembled π-conjugated dithiols and diisocyanides inside nanoholes, were obtained rather than a tunneling behavior commonly found in alkanethiol self-assembled monolayers. This is the first time that a consistent series of data are collected for a polymer and interpreted based on a multicurve fitting method, based on the linear combination of tunneling, Frankel-Pool and hopping mechanims, indicating that various independent conduction pathways are present in the junctions.

    Scopus

    その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=3142649554&origin=inward

  • Advances in nanolithography using molecular rulers 査読有り

    Anderson M., Tan L., Tanaka H., Mihok M., Lee H., Horn M., Weiss P.

    Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures   21 ( 6 )   3116 - 3119   2003年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)

    The developments in nanolithography were studied using molecular rulers process. This process utilizes the controlled placement and thickness of self-assembled multilayers. The combination of conventional lithographic technqiues with chemical self-assembly allows for the creation of nanostructures, whose spacing and edge resolution reach nanometer-scale precision. Fabrication techniques combining conventional nanolithography with chemical self-assembly allow for the feasible and parallel construction of nanostructures in the sub-100 nm regime.

    Scopus

    その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0942289201&origin=inward

  • Exploiting intermolecular interactions and self-assembly for ultrahigh resolution nanolithography 査読有り

    Anderson M., Smith R., Donhauser Z., Hatzor A., Lewis P., Tan L., Tanaka H., Horn M., Weiss P.

    Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures   20 ( 6 )   2739 - 2744   2002年11月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)

    An overview is given on several means by which self-assembly processes can be utilized to pattern surfaces for technological applications. Hybridization of current nanofabrication techniques with selective chemical functionalization and methods are shown to be vital for the connection and application of molecular devices and also as an economical and parallel means to reach smaller scales in conventional electronic (and other) devices.

    DOI: 10.1116/1.1515301

    Scopus

    その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036883154&origin=inward

  • Electronic band structure and magnetism of Fe<inf>16</inf>N<inf>2</inf> calculated by the FLAPW method 査読有り

    Tanaka H., Harima H., Yamamoto T., Katayama-Yoshida H., Nakata Y., Hirotsu Y.

    Physical Review B - Condensed Matter and Materials Physics   62 ( 22 )   15042 - 15046   2000年12月

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Electronic band structure calculations based on the full-potential linear augmented plane-wave method have been performed for Fe16N2. The calculations are performed with the crystal parameters recently refined [H. Tanaka et al., Acta Mater. 45, 1401 (1997)] in addition to the previous reported structure [K. H. Jack, Proc. R. Soc. London, Ser. A 208, 200 (1951)]. Jack's model (J model) led to the model of Tanaka et al. (T model), where Fe atoms at the 8h site shift to N atoms along the [110] direction. The calculated average moment per Fe atom for the T model is slightly smaller than that for the J model. We cannot theoretically expect a large magnetic moment based on any Fe16N2 structure. The presence of another material that has a large magnetic moment must be considered to explain the large magnetic moment of the Fe-N system.

    DOI: 10.1103/PhysRevB.62.15042

    Scopus

    その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0034454946&origin=inward

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著書

  • 分子アーキテクトニクス~単分子技術が開く新たな機能~

    多田博一、赤井恵、浅井哲也、田中啓文、寺尾潤、平瀬肇(監修)

    日本化学会  2018年01月 

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    記述言語:日本語

口頭発表・ポスター発表等

  • 真空分子スプレーによる基板へのグラフェンナノリボン吸着

    安藤 紗絵子, 稲見 栄一, 田中 啓文, 山田 豊和

    表面科学学術講演会要旨集 

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    開催期間: 2017年01月   記述言語:英語  

    <br><br>我々は自作超高真空STM装置を用いカーボンナノチューブをアンジップし得たグラフェンナノリボン(GNR)の研究を行っている。GNR溶液をAu基板上に大気中で滴下し真空槽内にて加熱した。この手法では溶媒の不純物吸着による汚染は避けられない。そこで新たに上記装置に真空分子スプレーを自作し取り付けた。溶媒を真空中に拡散する事で、GNRのみを基板上に吸着できる。詳細を報告する。

    CiNii Article

  • Neuron-like signal generation and its chaotic analysis of single-walled carbon nanotube and nanoparticle complex

    H. Tanaka, H. Tamukoh, T. Asai, T. Ogawa

    International Congress on Scanning Probe Microscopy 

     詳細を見る

    開催期間: 2014年12月11日 - 2014年12月13日   記述言語:英語  

  • Electrical properties of complex of nanoparticles and single-walled carbon nanotube

    Hirofumi Tanaka, Liu Hong, Minoru Fukumori, Daisuke Tanaka and Takuji Ogawa

    225th ECS Meeting 

     詳細を見る

    開催期間: 2014年05月11日 - 2014年05月15日   記述言語:英語   開催地:フロリダ州オーランド  

工業所有権

  • 3次元電気素子及びそれを備えた機械学習システム

    田中啓文、宇佐美雄生、サマン・アズハリ

     詳細を見る

    出願番号:特願2020-174660  出願日:2020年10月16日

講演

  • In-Materio Computing Devices Consisted of Random Network Nanoparticles for Autonomous Robot Operation Systems

    ISPlasma2022/IC-PLANTS2022  2022年03月  ISPlasma2022/IC-PLANTS2022 運営委員会

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    開催期間: 2022年03月06日 - 2022年03月10日   発表言語:英語   講演種別:招待講演   開催地:Nagoya University   国名:日本国  

  • Smart sensors by intelligent materials

    The 6th Electron Devices Technology and Manufacturing Conference (EDTM2022)  2022年03月  IEEE Electric Device Society

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    発表言語:英語   講演種別:特別講演   開催地:Online  

  • ランダムネットワークが生み出すマテリアル知能:インマテリオ物理リザバー

    東京理科大学 化学特別講義1  2022年01月  東京理科大学 理学研究科 化学専攻

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    発表言語:日本語   講演種別:招待講演   開催地:東京理科大と遠隔接続  

  • ランダムネットワークが生み出すマテリアル知能: インマテリオ物理リザバー

    第3回ブレインウェア工学研究会  2021年12月 

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    発表言語:日本語   講演種別:招待講演   開催地:遠隔  

  • In-Materio Computing Devices Consisted of Random Network Nanoparticles for Autonomous robotics

    MEMRISYS 2021 Conference  2021年11月 

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    発表言語:英語   講演種別:招待講演  

  • Fabrication and Characterization of Unzipped Graphene Nanoribbons

    7th International Conference on Superconductivity and Magnetism- ICSM2020  2021年10月 

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    発表言語:英語   講演種別:招待講演  

  • ナノ材料ネットワークの時間ダイナミクスが拓く物理リザバーの演算機能

    第82回応用物理学会秋季学術講演会  2021年09月  応用物理学会

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    発表言語:日本語   講演種別:招待講演   開催地:遠隔  

  • ランダムネットワークが生み出すマテリアル知能: インマテリオ物理リザバー

    第82回応用物理学会秋季学術講演会  2021年09月  応用物理学会

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    発表言語:日本語   講演種別:招待講演   開催地:遠隔  

    https://meeting.jsap.or.jp/invited-speakers

  • 海馬・偏桃体・前頭前野の機能を統合した脳型AI ハードウェア

    第82回応用物理学会秋季学術講演会  2021年09月 

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    発表言語:日本語   講演種別:招待講演   開催地:遠隔  

  • In-Materio Reservoir Computing Devices Consisted of Random Network Structures

    AFM_AMEC2021  2021年07月  Materials Research Society Thailand

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    発表言語:英語   講演種別:招待講演  

  • Random Network Structure of Materials Developing Next Generation AI Devices for Autonomous Robotics

    ECS conference  2021年06月 

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    発表言語:英語   講演種別:招待講演  

  • Reservoir computing device composed by chemical dynamics

    UCLA Physical Chemistry seminar series  2021年04月  UCLA

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    講演種別:招待講演   開催地:UCLA  

  • Nanoparticle Network as an Effective In-Materio Reservoir Computing Device

    ISASE2021  2021年04月  Ataturk University and University Putora Malaysia

     詳細を見る

    発表言語:英語   講演種別:招待講演   開催地:Ataturk University (online)  

  • Nanoparticle Network as an Effective In-Materio Reservoir Computing Device

    ISASE2021  2021年04月  Ataturk University and University Putora Malaysia

     詳細を見る

    開催期間: 2021年04月07日 - 2021年04月09日   発表言語:英語   講演種別:招待講演   開催地:Ataturk University, Turkey  

  • Random network structure of materials developing next generation AI devices for autonomous systems

    IUMRS-ICA2021  2021年02月 

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    発表言語:英語   講演種別:招待講演   開催地:Chengmai, Thailand (online)  

  • Recent Development of Neuromorphic AI Hardware

    The 14th International collaboration Symposium on Information, Production and Systems (ISIPS 2020)  2020年11月 

     詳細を見る

    発表言語:英語   講演種別:招待講演   開催地:北九州学術研究都市  

  • ニューロモルフィックAIハードウェア研究センターの取り組みと今後

    北九州学研都市フォーラム  2020年10月  北九州産業学術推進機構

     詳細を見る

    発表言語:日本語   講演種別:特別講演   開催地:北九州学研都市会議場  

  • SWNT/ポリ酸ランダムネットワークによる脳型パルス発生と ニューロモルフィック演算

    高分子討論会  2020年09月  高分子学会

     詳細を見る

    発表言語:日本語   講演種別:招待講演   開催地:遠隔  

    近年深層学習の優れた計算能力が広く認知され、人工知能の実応用が急速に広がっている。一方で、人工知能アルゴリズムを実行するハードウェアは、シリコンCMOS技術のスケーリングの物理的限界に直面し、性能向上は頭打ちが予想される。このため神経情報処理系である人工ニューラルネットワーク(ANN)やその応用形である深層学習システム(以下本稿ではこれらを人工知能システムと呼ぶ)を物理的に実装するハードウェア技術とそれを支える新しい材料・デバイスへの関心が高まっている。求められるデバイス機能として、従来の計算システムと決定的に異なるのは、ダイナミクスの利用である。ナノマテリアルの非線形性やネットワーク構造を巧みに用いることで、自発的にパルスやノイズを発生するデバイスの実現が期待される。これらのデバイスは人工知能システムの飛躍的な低消費電力化や高集積化を可能とする。また、ANNの学習プロセスでは重み付き加算(積和演算)部分の重みを絶えず変更し記憶する必要性があり、これに代わる電力消費量の小さいデバイスも求められる。我々は分子やナノカーボンマテリアルを用い、ANNに置き換わる機能を実現する材料研究を進めている。本稿ではこれらナノマテリアルとネットワークの形成、機能化のポイント、および我々の最近の研究成果について紹介する。

  • 多様な材料を利用したランダムネットワーク物理リザバーの比較

    第81回応用物理学会秋季講演会  2020年09月  応用物理学会

     詳細を見る

    発表言語:日本語   講演種別:その他   開催地:遠隔  

  • 多様な材料を利用したランダムネットワーク物理リザバーの比較

    応用物理学会秋季講演会  2020年09月  応用物理学会

     詳細を見る

    開催期間: 2020年09月08日 - 2020年09月11日   発表言語:日本語   講演種別:招待講演   開催地:遠隔  

    リカレントニューラルネットワーク(RNN)の一種であるリザバー演算は、多電極からの出力重みの学習のみを必要とするため、エネルギー効率が高くより速い予測や分類タスクを行えると期待されている。非線形性、メモリ効果、高次元性といったリザバーの特性を反映した物理的なハードウェアプラットフォームは、現状 AI システムで標準的に使われているソフトウェアベースのインターフェースに代替できるとして注目されている。本研究では、我々がすでにリザバーとしての有効性を確認している単層カ ーボンナノチューブ(SWNT)/ポリオキソメタレート集合体[1]、Ag/Ag2S 微粒子集合体、Ag/Ag2Se ナノワイヤー集合体など多様な材料を利用したランダムネットワーク(RNW)を構築し物理的リザバーとした際の電気測定結果を紹介する。また、波形生成と非線形自己回帰移動平均(NARMA)時系列予測の 2つのベンチマークタスクの結果を比較し、どの材料がリザバー演算にとって有効なのか検討する。

  • Application of nanomaterials for neuromorphic processing

    International workshop on Bioiontronics, ISIPS2019  2019年11月  Waseda University

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    発表言語:英語   講演種別:招待講演   開催地:FAIS  

  • Neuromorphic pulse generation from SWNT/POM random network for next generation computer

    MNC-2019  2019年10月  Japanese Society of Applied Physics

     詳細を見る

    発表言語:英語   講演種別:招待講演  

  • Neuromorphic pulse generation from SWNT/POM random network for next generation computer

    ISAS-2019  2019年10月  Ho Chi Minh City University of Technology

     詳細を見る

    発表言語:英語   講演種別:基調講演   開催地:Ho Chi Minh City University of Technology  

  • Neuromorphic pulse generation from SWNT/POM random network

    JCC-2019  2019年09月  Indonesia Chemical Scociety

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    発表言語:英語   講演種別:特別講演  

  • Neuromorphic pulse generation from SWNT/POM random network

    MRS-Thailand 2019  2019年07月  MRS-Thailand

     詳細を見る

    発表言語:英語   講演種別:招待講演   開催地:Pattaya  

  • Neuron like pulse generation by SWNT/POM random network

    The 3rd International Symposium on “Recent Trends in the Elucidation and Function Discovery of Next Generation Functional Materials of Surface / Interface Properties”  2018年06月  Osaka University

     詳細を見る

    発表言語:英語   講演種別:招待講演   開催地:Osaka University  

  • Fabrication of nanogap electrodes by molecular ruler method

    27th International Microprocesses and Nanotechnology Conference  2014年11月 

     詳細を見る

    開催期間: 2014年11月04日 - 2014年11月07日   発表言語:英語   講演種別:特別講演   開催地:Hilton Fukuoka Sea Hawk  

  • カーボンナノチューブネットワークを用いた脳型デバイス

    ナノカーボンバイオセンサーの医療応用研究会  2014年10月 

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    開催期間: 2014年10月09日   発表言語:英語   講演種別:特別講演  

  • Electric properties of single-walled carbon nanotube and nanoparticle complex for neuron-like signal generation

    Seminar of Materals and Metallurgy2014  2014年10月  LIPI

     詳細を見る

    開催期間: 2014年10月02日   発表言語:英語   講演種別:特別講演  

  • Electric properties of single-walled carbon nanotube and nanoparticle complex for neuron-like signal generation

    MRS-Id  2014年09月 

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    開催期間: 2014年09月26日 - 2014年09月28日   発表言語:英語   講演種別:特別講演  

▼全件表示

報道関係

  • 九州工業大学の田中啓文教授、タイ国立大から名誉学位   新聞・雑誌

    田中啓文

    日本経済新聞  日本経済新聞  41面  2022年07月29日

     詳細を見る

    執筆者:本人以外  

  • マテリアルベースでのリザバー演算素子の開発とロボティクスへの応用に成功   新聞・雑誌

    田中啓文

    日本経済新聞  日本経済新聞  電子版  2022年01月06日

     詳細を見る

    執筆者:本人以外  

  • 呉高専、九州工大との包括連携   新聞・雑誌

    田中啓文

    日刊工業新聞  2021年10月14日

  • 導電性高分子を用いた「物理リザバー計算」による音声認識、九工大が成功   インターネットメディア

    宇佐美雄生, 松本卓也, Wilfred van der Wiel, ⽥中啓⽂

    まいなびニュース  2021年09月23日

  • 脳型コンピューター、材料で革新   新聞・雑誌

    田中啓文

    日経産業新聞  2021年09月17日

  • 層数制御した多層GNR   新聞・雑誌

    根岸良太,小林慶裕,森伸也,田中啓文

    科学新聞  2021年07月02日

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学術関係受賞

  • 名誉博士号

    スラナリー工科大学   2021年09月25日

    田中啓文

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    受賞国:タイ王国

科研費獲得実績

  • ナノシステムの化学ダイナミクスを利用した超低消費電力マテリアルリザバーの開発

    研究課題番号:22H01900  2022年04月 - 2026年03月   基盤研究(B)

  • 強相関電子材料のドメイン界面における異常配位環境を利用した新奇機能性開拓

    研究課題番号:17H03393  2017年04月 - 2020年03月   基盤研究(B)

     詳細を見る

    強相関電子材料のドメイン界面における異常配位環境を利用し、新奇機能性を開拓する

  • アンジップ単層グラフェンナノリボンの革新的エッジエンジニアリング

    研究課題番号:15H03531  2015年04月 - 2018年03月   基盤研究(B)

  • パルス発生する負性抵抗素子カーボンナノチューブネットワークの脳型情報処理への応用

    研究課題番号:15K12109  2015年04月 - 2017年03月   挑戦的萌芽研究

  • 非対称、非線形単分子電気特性を示す有機・無機混成分子系の合成と機能集積化

    研究課題番号:25110002  2013年06月 - 2018年03月   新学術領域研究

  • カーボンナノシステムの有機分子修飾による電子特性制御

    研究課題番号:24510150  2012年04月 - 2015年03月   基盤研究(C)

  • 機能性単一分子の電子機能/構造相関の解明

    研究課題番号:23310076  2011年04月 - 2014年03月   基盤研究(B)

  • カーボンナノチューブ電極による単分子電子素子の研究

    研究課題番号:19310079  2007年04月 - 2010年03月   基盤研究(B)

  • カーボンナノチューブ配線上でナノデバイスとして動作する平面分子の電気特性評価

    研究課題番号:18710104  2006年04月 - 2008年03月   若手研究(B)

  • ナノチューブ上での金属クラスター構造制御と物性

    研究課題番号:17310059  2005年04月 - 2007年03月   基盤研究(B)

  • ナノ球リソグラフィーとシャドーコーン法によるナノロッド配列の作製と光学特性評価

    研究課題番号:16651073  2004年04月 - 2006年03月   萌芽研究・萌芽的研究

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受託研究・共同研究実施実績

  • 上野精機次世代先端共同研究講座

    2022年04月 - 現在

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    研究区分:共同研究

  • シャドウコーン法を使った直立ナノロッド配列作製とその応用

    2004年04月 - 2005年03月

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    研究区分:共同研究

寄附金・講座

  • 上野精機株式会社寄付金  上野精機株式会社  2022年08月

  • 上野精機次世代先端技術共同研究講座  上野精機(株)  2022年04月

その他競争的資金獲得実績

  • 公益財団法人北九州産業学術推進機構新成長戦略推進研究開発事業 カーボンナノチューブによる偶発的回路構造を利用した触覚センシング

    2020年04月 - 2021年03月

    北九州産業学術推進機構新成長戦略推進研究開発事業  

  • 自動トマト収穫ロボット搭載用の熟れ度検出のための革新的触覚センサーと機械学習自動判別システムの開発研究

    2018年04月 - 2019年02月

    北九州産業学術推進機構新成長戦略推進研究開発事業  

  • アンジップグラフェンナノリボンの交差構造の電気物性制御

    2015年04月 - 2016年03月

    池谷科学技術研究助成  

  • カーボンナノシステムの有機分子修飾による電子特性制御

    2012年04月 - 2014年09月

    稲盛財団助成  

  • ナノギャップの形成に関する研究

    2005年07月 - 2010年03月

    文部科学省 キーテクノロジー 研究開発の推進(ナノテク融合)  

  • カーボンナノチューブ配線上でナノデバイスとして動作する平面分子に関する研究

    2005年04月 - 2006年03月

    石川カーボン 科学技術振興財団  

  • 固体電解質ナノスイッチを用いた 学習機能回路の研究

    2005年04月 - 2006年03月

    三菱財団自然科学研究助成  

  • 単層カーボンナノチューブ配線上へのナノサイズ分子デバイスの配置と点接触電流イメージング原子間力顕微鏡を用いた特性評価

    2005年04月 - 2006年03月

    島津科学技術振興財団  

  • 巨大ポルフィリンアレーのメゾスコピック構造デバイス

    2001年04月 - 2006年03月

    CREST  

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海外研究歴

  • グラフェンナノリボン・有機分子ナノ複合体の磁気測定

    復旦大学  中華人民共和国  研究期間:  2011年10月22日 - 2011年12月22日

  • Fabrication of graphene /organic molecular nanocomplex

    ライス大学  アメリカ合衆国  研究期間:  2011年01月25日 - 2011年04月10日

担当授業科目(学内)

  • 2022年度   知能集積システム2

  • 2021年度   人間知能システム工学特論1

  • 2021年度   知能集積システム2

  • 2021年度   フロンティア工学実習

  • 2021年度   人間知能システム工学特論2

  • 2021年度   Robot Operating System 演習

  • 2021年度   AARセミナー

  • 2021年度   工学基礎

  • 2020年度   工学基礎

  • 2020年度   知能集積システム2

  • 2020年度   フロンティア工学実習

  • 2020年度   脳型システム

  • 2019年度   工学基礎

  • 2019年度   知能集積システム2

  • 2018年度   工学基礎1

  • 2018年度   知能集積システム2

  • 2018年度   工学基礎

  • 2017年度   知能集積システム2

  • 2016年度   工学基礎1

  • 2016年度   知能集積システム2

  • 2015年度   工学基礎1

  • 2015年度   知能集積システム2

  • 2014年度   知能集積システム2

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担当経験のある授業科目(学外)

  • ナノサイエンス特別講義A

    機関名:福岡大学

  • 工学特論II

    機関名:工学特論II

教育活動に関する受賞・指導学生の受賞など

  • 応用物理学会講演奨励賞

    応用物理学会   Ag2SeとAg2Sナノワイヤネットワーク物理デバイスの性能比較  

    2022年05月22日

    琴岡匠(指導学生)

     詳細を見る

    受賞国:日本国

  • The best student presentation award

    Society of Neuromorphic AI Hardware   Short-Term and Long-Term Plasticity of Pt/Ag-Ag2S Nanoparticles Network/Pt Artificial Synapses  

    2022年03月22日

    Oradee Srikimkaew

     詳細を見る

    受賞国:日本国

  • Student presentation award

    Society of Neuromorphic AI Hardware   Performance comparison of Ag2S and Ag2Se nanowire random network devices as physical reservoirs  

    2022年03月22日

    Takumi Kotooka

     詳細を見る

    受賞国:日本国

  • Student Award

    ACSIN-24 & ICSPM26合同国際会議  

    2019年10月19日

    Hadiyawarman

  • ポスター賞

    SAES2017  

    2017年11月17日

その他教育活動

  • 呉高専との包括連携協定

    2021年10月
    -
    現在

学会・委員会等活動

  • ナノ学会   理事 兼 ナノ構造・物性部会 部会長  

    2021年05月 - 現在

  • MEMRYSYS2020国際会議   論文審査委員  

    2020年11月 - 現在

  • International Microprocesses and Nanotechnology Conference   セッションサブヘッド  

    2020年11月 - 現在

  • 分子アーキテクトニクス研究会   会長  

    2019年11月 - 現在

  • IMAA   Comittee member  

    2017年04月 - 現在

  • ナノ学会   ナノ構造・物性部会 副部会長  

    2016年04月 - 2021年05月

  • 応用物理学会   プログラム編集委員  

    2014年04月 - 2018年03月

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社会貢献活動(講演会・出前講義等)

  • 塔野小学校キャリアスタディ

    役割:講師

    2021年02月18日

     詳細を見る

    対象: 小学生

    種別:出前授業

    八幡西区塔野小学校にて6年生を対象にしたキャリアスタディに出前出張。大学教授の仕事とは何かを説明した。
    主催者:塔野小学校及び同校PTA
    役割:講演者
    会場:遠隔

  • 塔野小学校キャリアスタディ

    2019年02月25日

     詳細を見る

    対象: 小学生

    種別:出前授業

    八幡西区塔野小学校にて6年生を対象にしたキャリアスタディに出前出張。大学教授の仕事とは何かを説明した。
    主催者:塔野小学校及び同校PTA
    役割:講演者
    会場:同校体育館

国際会議開催(学会主催除く)

  • The 3rd International symposium on Neuromorphic AI Hardware

    Society of International Symposium on Neuromorphic AI Hardware  Premier Hotel Mojiko, Kitakyushu, Japan  2022年03月18日 - 2022年03月19日

  • The 2nd International symposium on Neuromorphic AI Hardware

    Society of Neuromorphic AI Hardware, Research Center for Neuromorphic AI Hardware, Kitakyushu Convention Association  Online  2020年12月07日

  • International symposium on Neuromorphic AI Hardware

    九州工業大学脳型ハードウェア研究センター設立委員会  Royal Hotel Yahata  2019年12月10日 - 2019年12月11日

国際交流窓口担当

  • スラナリー工科大学科学院  タイ王国  2019年02月 - 現在

  • ホーチミン市工科大学  ベトナム社会主義共和国  2017年11月 - 現在

その他国際交流活動

  • スラナリー工科大学より名誉学位授与

    活動期間: 2021年09月 - 現在

     詳細を見る

    スラナリー工科大学より名誉学位を授与された。
    所管はタイ王室で、シリンドホーン王女より直接お手渡し。