研究者詳細 - 永松　秀一

論文 - 永松　秀一

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Layer-by-layer coating of oriented conjugated polymer films towards anisotropic electronics 査読有り国際誌

Pandey M., Sadakata S., Nagamatsu S., Nagamatsu S., Pandey S., Hayase S., Hayase S., Takashima W.

Synthetic Metals 227 29 - 36 2017年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017Dynamic casting of floating-film and transferring method for preparing oriented multilayer films of conjugated polymers is reported. This method is based on dynamic casting of a floating-film on liquid substrate to obtain oriented thin-film followed by its transfer on a desired solid substrate. The uniqueness in this method lies in the isolation of casting and coating procedures of oriented films, which enables us to fabricate the oriented multilayer with minimum interlayer interference. It provides a key-technology to build up the organic multi-layered architecture while preserving oriented morphologies. Several types of multilayer films have been prepared and investigated in detail in terms of their film characteristics. The layer-by-layer coating of oriented films demonstrated by this method is found to be a unique feature which overcomes cumbersome procedures in the conventional orientation methods. The coating procedure demonstrated in this study provides a facile methodology to construct anisotropic architectures.

DOI： 10.1016/j.synthmet.2017.02.018

Scopus

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Solvent driven performance in thin floating-films of PBTTT for organic field effect transistor: Role of macroscopic orientation 査読有り国際誌

Pandey M., Pandey S., Nagamatsu S., Nagamatsu S., Hayase S., Hayase S., Takashima W., Takashima W.

Organic Electronics: physics, materials, applications 43 240 - 246 2017年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V.Considering the advantages of floating film transfer method (FTM), we have investigated the optical and electronic characteristics of PBTTT-C14 thin-films prepared by the static and the dynamic casting on liquid substrate. It has been demonstrated that judicious selection of solvents during FTM switches the casting mode from the static casting (S-FTM) using high boiling point solvent to the dynamic casting (D-FTM) from low boiling point solvent. Although both of the methods provide the edge-on oriented structure of PBTTT-C14 by XRD, the structural and the optical analyses reveal relatively extended π-conjugation length in parallel D-FTM film as compared to that of S-FTM. A high field-effect mobility (μ) of 0.11 cm2/V.s was exhibited by OFETs fabricated by parallel D-FTM film even without any high temperature post-annealing up to the liquid crystalline phase transition. This observed value of μ for parallel D-FTM is 4.7 and 12.8 times higher than the isotropic S-FTM and the perpendicular D-FTM films, respectively.

DOI： 10.1016/j.orgel.2017.01.031

Kyutacar

Scopus

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Controlling factors for orientation of conjugated polymer films in dynamic floating-film transfer method 査読有り国際誌

Pandey M., Pandey S., Nagamatsu S., Nagamatsu S., Hayase S., Takashima W., Takashima W.

Journal of Nanoscience and Nanotechnology 17 ( 3 ) 1915 - 1922 2017年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2017 American Scientific Publishers All rights reserved.Orientation in conjugated polymers is a unique phenomenon by the virtue of their one dimensionality leading to semiconductor performances in organic electronic devices. A unique, cost-effective and highly efficient method for the fabrication of oriented thin film consisted of non-regiocontrolled poly(3-hexylthiophene) (NR-P3HT) using dynamic floating-film transfer method (dynamic-FTM) has been investigated. Orientation of NR-P3HT by dynamic-FTM has been quantitatively measured as the optical anisotropy represented by dichroic ratio (DR). Amongst several factors like concentration of polymer solution, temperature and viscosity of liquid-substrate along with post-annealing temperature, viscosity of liquid-substrate plays a crucial role in controlling the molecular orientation. A judicious control and optimization of various underlying factors affecting the molecular orientation led to relatively high DR of 9.3 even in NR-P3HT films cast by dynamic-FTM.

DOI： 10.1166/jnn.2017.12816

Scopus

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Synthesis, characterization and air stable semiconductor properties of thiophene-condensed pyrene derivatives 査読有り国際誌

Moriguchi T., Higashi M., Yakeya D., Jalli V., Tsuge A., Okauchi T., Nagamatsu S., Takashima W.

Journal of Molecular Structure 1127 413 - 418 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V.New and simple polyaromatic compounds containing two thiophene rings were prepared via photo-cyclization and their structural and photophysical properties were evaluated via 1H NMR spectroscopy and X-ray crystallographic analysis. On the basis of X-ray analysis, it was determined that the molecular structure of the compound was highly strained and that they contain two hetero [4] helicene moieties. The compounds were investigated as active layer in p-type organic field-effect transistors (p-OFET) in top contact type devices. Notably, the compound containing two thiophene components exhibited very stable p-type semiconducting behavior in moist air.

DOI： 10.1016/j.molstruc.2016.07.104

Scopus

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2016年度第1回九州支部市民講座「表面によって変化する物の性質—表面を見る？・調べる？・活用する？—」

永松秀一

表面科学 ( 公益社団法人日本表面科学会 ) 38 ( 7 ) 367 - 367 2017年01月

Influence of backbone structure on orientation of conjugated polymers in the dynamic casting of thin floating-films 査読有り国際誌

Pandey M., Pandey S., Nagamatsu S., Nagamatsu S., Hayase S., Hayase S., Takashima W., Takashima W.

Thin Solid Films 619 125 - 130 2016年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V.Dynamic casting of conjugated polymer films on liquid-substrate is a unique method which provides thin floating-film and can be easily transferred on a desired substrate by stamping. The important feature in this procedure is associated with the formation of thin polymeric film during compression and solidification controlled by viscous drag of liquid substrate and solvent evaporation of the polymer, respectively. Lyotropic liquid-crystalline (LC) characteristics of conjugated polymer possibly assist to orient the polymer chain in one direction. It is found that this method produce highly oriented thin films (dichroic ratio > 5) of thiophene-based conjugated polymers such as PBTTT-C14, PQT-C12 and non-regiocontrolled poly(3-hexylthiophene) NR-P3HT. On the other hand, weak orientation intensity in regioregular poly(3-hexylthiophene) RR-P3HT was found. The mechanism for this diverse orientation in thiophene-based conjugated polymers is discussed in correlation with the backbone chemical structure and lyotropic LC phase transition during the floating-film formation.

DOI： 10.1016/j.tsf.2016.11.015

Kyutacar

Scopus

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Enhancement of carrier mobility along with anisotropic transport in non-regiocontrolled poly (3-hexylthiophene) films processed by floating film transfer method 査読有り国際誌

Pandey M., Nagamatsu S., Nagamatsu S., Pandey S., Hayase S., Hayase S., Takashima W., Takashima W.

Organic Electronics: physics, materials, applications 38 115 - 120 2016年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V.A newly developed floating film transfer method (FTM) has been successfully utilized to fabricate oriented thin films of non-regiocontrolled poly (3-hexyl thiophene) (NR-P3HT) followed by the fabrication of organic field effect transistors (OFETs). AFM microstructural investigations demonstrate the facile molecular alignment of NR-P3HT by FTM leading to highly oriented macromolecular assemblies like fibrous domains with considerably enhanced π-conjugation length. FTM thin films of NR-P3HT not only show enhanced optical anisotropy (dichroic ratio >8) but also significantly improved FET characteristics. FTM films in its parallel orientation exhibited a significant improvement (>2 orders) in the FET mobility as compared to its spin-coated device counterparts.

DOI： 10.1016/j.orgel.2016.08.003

Kyutacar

Scopus

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Molecular structures of n-type semiconducting material 2, 5-difluoro-1, 4-phenylene-3, 3′-bis {2-[(4-trifluoromethyl) phenyl] acrylonitrile} and its photo dimerization product 査読有り

Tetsuji Moriguchi, Naoya Kitou, Venkataprasad Jalli, Kenji Yoza, Shuichi Nagamatsu, Tatsuo Okauchi, Akihiko Tsuge, Wataru Takashima

Journal of Molecular Structure 2016年08月

Orientation Characteristics of Non-regiocontrolled Poly (3-hexyl-thiophene) Film by FTM on Various Liquid Substrates 査読有り

Pandey M., Nagamatsu S., Nagamatsu S., Pandey S., Hayase S., Hayase S., Takashima W., Takashima W.

Journal of Physics: Conference Series 704 ( 1 ) 2016年04月

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）

Orientation characteristics of non-regiocontrolled poly (3-hexylthiophene) (NR-P3HT) films prepared by dynamic casting of floating film and transferring method (FTM) has been investigated. The film was first cast on liquid-substrate to obtain as a floating-film followed by its transfer on solid-substrate such as white-glass or Si-wafer in order to evaluate their optoelectronic characteristics. As a possible key-factor to generate the orientation of conjugated polymer in this method we focused on the components of liquid-substrate in this study. The orientation dependence upon various liquid-substrates reveals that dichroic ratio strongly changes with liquid-substrates. Pictures of floating-film show the change in size of floating-parts depending upon the liquid-substrate, representing the expansion length of casting solution upon the viscosity. These findings have indicated that spreading speed of polymer solution and solvent evaporation speed controls the size of floating-film leading to change in the orientation intensity. The multilayer coatings of oriented NR-P3HT films were used for polarized FTIR analysis exhibiting clear dichroism. The obtained dichroic characteristics were well corresponded with in-plane, out-of-plane and non-oriented vibronic modes of P3HT.

DOI： 10.1088/1742-6596/704/1/012005

Scopus

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A comparative study of spin coated and floating film transfer method coated poly (3-hexylthiophene)/poly (3-hexylthiophene)-nanofibers based field effect transistors 査読有り

Shashi Tiwari, Wataru Takashima, S Nagamatsu, SK Balasubramanian, Rajiv Prakash

Journal of Applied Physics 116 ( 9 ) 094306 2014年09月

Molecular Structure and Crystal Packing of n-Type Semiconducting Material 3',3'-(1,4-Phenylene) bis {2'-(4"-trifluoromethyl) phenyl} acrylonitrile 査読有り国際誌

Tetsuji Moriguchi, Shuichi Nagamatsu, Tatsuo Okauchi, Akihiko Tsuge, Wataru Takashima, Shuji Hayase

Journal of Crystallography 2014 2014年08月

P3HT-fiber-based field-effect transistor: Effects of nanostructure and annealing temperature 査読有り国際誌

Shashi Tiwari, Wataru Takashima, Sirkazhi Krithivasan Balasubramanian, Shougo Miyajima, Shuichi Nagamatsu, Shyam Sudhir Pandey, Rajiv Prakash

Japanese Journal of Applied Physics 53 ( 2 ) 021601 2014年02月

Fabrication of Large-scale Drop-cast Films of π-conjugated Polymers with Floating-film Transfer Method 査読有り国際誌

Dauendorffer Arnaud, Rajiv K Pandey, Syougo Miyajima, Shuichi Nagamatsu, Rajiv Prakash, Wataru Takashima, Shuzi Hayase, Keiichi Kaneto

Transactions of the Materials Research Society of Japan 38 ( 2 ) 305 - 308 2013年12月

Macroscopic self ordering of solution processible poly (3,3'-dialkylquaterthiophene) by floating film transfer method 査読有り国際誌

Rajiv K Pandey, Wataru Takashima, Shuichi Nagamatsu, Arnaud Dauendorffer, K Kaneto, Rajiv Prakash

Journal of Applied Physics 114 ( 5 ) 054309 2013年08月

Electrophoretic deposition onto an insulator for thin film preparation toward electronic device fabrication 査読有り国際誌

Shougo Miyajima, Shuichi Nagamatsu, Shyam S Pandey, Shuzi Hayase, Keiichi Kaneto, Wataru Takashima

Applied Physics Letters 101 ( 19 ) 193305 2012年11月

One-Step Deposition of Self-Oriented β-Phase Polyfluorene Thin Films for Polarized Polymer Light-Emitting Diodes 査読有り国際誌

Arnaud Dauendorffer, Shougo Miyajima, Shuichi Nagamatsu, Wataru Takashima, Shuzi Hayase, Keiichi Kaneto

Applied Physics Express 5 ( 9 ) 092101 2012年09月

Optical and Transport Anisotropy in Poly(9,9'-dioctyl-fluorene-alt-bithiophene) Films Prepared by Floating Film Transfer Method 査読有り国際誌

Arnaud Dauendorffer, Shuichi Nagamatsu, Wataru Takashima, Keiichi Kaneto

Japanese Journal of Applied Physics 51 ( 5 ) 055802 6頁 2012年04月

Bis(alkyl-thiophene) thienothiophene as hole-transport organic semiconductor 査読有り国際誌

Kazuhiro Takamiya, Shuhei Ishikawa, Daisuke Adachi, Shinya Oku, Shuichi Nagamatsu, Wataru Takashima, Shuzi Hayasea, Keiichi Kaneto

Physics Procedia 14 182 - 186 2011年07月

ポリチオフェン、オリゴチオフェンの配向制御とデバイス応用査読有り

谷垣宣孝, 武智恭世, 溝黒登志子, HECK Claire, 永松秀一, 吉田郵司

Molecular electronics and bioelectronics 22 ( 2 ) 119 - 122 2011年05月

アルキルチオフェン-チエノチオフェン誘導体の正孔輸送特性と大気安定性査読有り

石川修平, 永松秀一, 高嶋授, 金藤敬一

電子情報通信学会技術研究報告. SDM, シリコン材料・デバイス 111 ( 4 ) 47 - 50 2011年04月

記述言語：日本語掲載種別：研究論文（学術雑誌）

アルキルチオフェンで修飾されたシンプルな分子構造を有する低分子有機半導体の正孔輸送特性と大気安定性について調査した。チエノチオフェンを中心骨格に有する誘導体では、アルキル末端鎖長が6,8で最大移動度が観測された。一方、アルキル末端鎖長8,12で乾燥大気下での優れた安定性が観測された。AFM測定結果から、アルキル末端鎖長により膜形態が変化することがわかった。正孔輸送特性及び大気安定性を、膜形態との相関で詳細に議論した。

CiNii Article

その他リンク： http://ci.nii.ac.jp/naid/110008689382

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