研究者詳細 - 村上　直也

論文 - 村上　直也

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Cyclic time-separated redox reaction using accumulated electrons in titanium(iv) oxide in a two-phase system 査読有り国際誌

Suenaga M., Murakami N.

Catalysis Science and Technology 14 ( 3 ) 624 - 629 2023年12月

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）

A time-separated redox reaction using accumulated electrons in titanium(iv) oxide (TiO2) was cyclically repeated in order to increase the amount of the reduction product that has been limited by the saturation value of accumulated electrons in TiO2. Repetition of the reaction was carried out by utilizing an organic/aqueous two-phase system and the insolubility of substrates and target products in the aqueous phase. The reaction proceeded by repeating two steps: (1) electron accumulation in TiO2 at the bottom of the aqueous phase was induced under ultraviolet irradiation with low-speed stirring and (2) reduction by accumulated electrons in the two-phase interface was performed in the dark with high-speed stirring. Results indicated that the amount of the product monotonically increased as a function of the number of repetition cycles. The relationship of the product amount with the physical and chemical properties of TiO2 is discussed.

DOI： 10.1039/d3cy01645e

Kyutacar

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Electron Trap Analysis of Tin(II) Niobate Photocatalyst Particles Using Photoacoustic Infrared Spectroscopy 査読有り国際誌

Tatsuki Shinoda, Toshio Hayashi, Yuichi Yamaguchi, Akihiko Kudo, Naoya Murakami

The Journal of Physical Chemistry C 127 ( 28 ) 13706 - 13711 2023年07月

Photoacoustic Spectroscopic Analysis of Electron-Trapping Sites in Titanium(IV) Oxide Photocatalyst Powder Treated by Ball Milling 査読有り国際誌

Shinoda T., Yamaguchi Y., Kudo A., Murakami N.

Journal of Physical Chemistry C 126 ( 49 ) 20975 - 20982 2022年12月

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）

Photoabsorption of trapped electrons in rutile titanium(IV) oxide (TiO2) before and after ball-milling and annealing treatments was investigated in a wide range of light wavelengths from visible to mid-infrared (IR) regions using photoacoustic spectroscopy (PAS). In the presence of an electron donor under an inert gas atmosphere, photoacoustic signals for all of the samples were increased by ultraviolet irradiation, resulting in the appearance of broad absorption due to electron accumulation in TiO2. For ball-milled TiO2with a large specific surface area (34 m2g-1), mid-IR absorption attributed to free electrons and shallowly trapped electrons was smaller than that of the pristine sample with a small specific surface area (2.8 m2g-1), but broad absorption ascribed to deeply trapped electrons dramatically increased in the range of near-IR to visible regions. This near-IR-visible absorption was slightly observed even in the presence of oxygen, and it was divided into two parts: one was characteristic near-IR absorption of rutile TiO2having a peak at ∼1.0 eV below the bottom of the conduction band, while the other was ball-milling-induced absorption with a peak at ∼1.7 eV. By annealing treatment, absorptions of free electrons/shallowly trapped electrons and deeply trapped electrons increased and decreased, respectively, although not as much as in the pristine sample. At that time, the specific surface area also decreased to 18 m2g-1. In the evaluation of photocatalytic activity, pristine TiO2showed the highest activity for hydrogen (H2) evolution from an aqueous solution containing an electron donor, whereas the rates of H2evolution for the ball-milled and subsequently annealed samples were 0.21 and 0.34 times lower than that for the pristine sample. Thus, we found from the results of PAS measurements that the main factor governing the photocatalytic activity is not specific surface area but the presence of deeper-energy electron-trapping sites formed by pulverization with ball milling.

DOI： 10.1021/acs.jpcc.2c07064

Kyutacar

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Elucidation of the behavior of oxygen remaining in water molecules after hydrogen atom abstraction in the plasma/liquid (P/L) interfacial reaction: improvement in the selectivity of ammonia synthesis and parallel production of hydrogen gas 査読有り国際誌

Yoshida S., Murakami N., Takatsuji Y., Haruyama T.

Green Chemistry 25 ( 2 ) 579 - 588 2022年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

The plasma/liquid interfacial (P/L) reaction is a non-catalytic reaction conducted at an ambient temperature and pressure. The reaction employs activated (dissociated or excited) nitrogen and abstracted hydrogen from water molecules to form ammonia. Herein we demonstrated that dissociated nitrogen (atomic nitrogen; Natom) promoted ammonia selectivity more efficiently than excited nitrogen molecules in P/L reactions. We investigated the behavior of water-derived oxygen after abstracting a hydrogen atom from a water molecule. We constructed a connecting reactor that directly connects the P/L reaction locus with a titania bead-filled packed-bed dielectric barrier discharge (PbDBD) device that exhibits high Natom generation efficiency. In this reactor, the P/L reaction produced aqueous ammonia with high selectivity and minimal aqueous nitrate ions, which are the typical by-products of the reaction. We also observed that oxygen and hydrogen atoms from water were released into the gas phase to form NO and hydrogen gases. The removal of oxygen as NO gas from the P/L reaction locus significantly improved the ammonia synthesis selectivity of the P/L reaction. Additionally, the ability to generate hydrogen gas during ammonia synthesis in the P/L reaction enables the simultaneous production of ammonia and hydrogen gas.

DOI： 10.1039/d2gc03491c

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Photoacoustic Infrared Analysis of the Reactivity of Electrons Accumulated in Titanium(IV) Oxide Particles Under a Liquid-phase Photocatalytic Condition 査読有り国際誌

Tatsuki Shinoda, Naoya Murakami

Chemistry Letters 52 ( 1 ) 13 - 16 2022年11月

Reduction of nitrate to ammonia using photocatalytically accumulated electrons on titanium(IV) oxide in a time-separated redox reaction 査読有り国際誌

Murakami N., Suenaga M., Deguchi R.

Inorganic Chemistry Communications 141 2022年07月

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）

Reduction of nitrate (NO3−) to ammonia (NH3) was performed by a time-separated redox reaction using photocatalytically accumulated electrons in a titanium(IV) oxide (TiO2) suspension. The time-separated redox reaction uses a two-step reaction under the control of photoexcitation and an electron acceptor: (1) accumulation of electrons in TiO2 powder under photoexcitation and (2) reduction of added NO3− by accumulated electrons in the dark. Color change of TiO2 depending on the degree of electron accumulation was observed during the reaction, and 8-electron reduction of NO3− to NH3 was performed by accumulated electrons. The results of the time-separated redox reaction using 10 kinds of commercial TiO2 powder indicate that the use of a rutile sample with a large number of trivalent titanium species is a key factor for NH3 production.

DOI： 10.1016/j.inoche.2022.109585

Kyutacar

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Fe(III)-Pt(II) oxide-co-sensitized brookite TiO2 nanorods for photocatalytic degradation of acetaldehyde under visible light 査読有り国際誌

Yu Cao, Shi Nee Lou, Sicong Wang, Hui Yang, Qitao Zhang, Chengyin Wang, Naoya Murakami, Teruhisa Ohno

Applied Catalysis A: General 634 118539 2022年03月

Accumulation Process of Photogenerated Electrons in Titanium(IV) Oxide Photocatalyst Particles: Photoacoustic Infrared Spectroscopy Study 査読有り国際誌

Tatsuki Shinoda, Naoya Murakami

Journal of Physical Chemistry C 126 ( 10 ) 4889 - 4898 2022年03月

Drastically Increase in Atomic Nitrogen Production Depending on the Dielectric Constant of Beads Filled in the Discharge Space 査読有り国際誌

Yuto Tsuchida, Naoya Murakami, Tatsuya Sakakura, Yoshiyuki Takatsuji, Tetsuya Haruyama

ACS Omega 6 ( 44 ) 29759 - 29764 2021年10月

Simultaneous Measurements of Photoabsorption and Photoelectrochemical Performance for Thickness Optimization of a Semiconductor Photoelectrode 査読有り

Murakami N., Watanabe R.

ACS Combinatorial Science 22 ( 12 ) 791 - 795 2020年12月

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 established a system for simultaneous measurements of photoelectrochemical (PEC) reaction and photoabsorption in a semiconductor photoelectrode. This system uses a photoacoustic technique and photoelectrodes with a film-thickness gradient that was prepared by electrophoretic deposition of tungsten(VI) oxide particles while pulling up a substrate. The system enabled high-throughput determination of optimum film thickness, and the results showed that irradiation direction has a significant influence on PEC performance for a photoelectrode with a thick film. Furthermore, the mechanism of enhancement of PEC performance by postnecking treatment was discussed.

DOI： 10.1021/acscombsci.0c00113

Kyutacar

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In situ photoacoustic analysis of near-infrared absorption of rhodium-doped strontium titanate photocatalyst powder 査読有り

Shinoda T., Yamaguchi Y., Kudo A., Murakami N.

Chemical Communications 56 ( 91 ) 14255 - 14258 2020年11月

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）

© The Royal Society of Chemistry. Near-infrared absorption of strontium titanate (SrTiO3) doped with rhodium (Rh) was investigated by photoacoustic (PA) Fourier transform infrared spectroscopy. In the absence of an electron acceptor and the presence of a hole scavenger, the largest absorption change in the Rh valence state from tetravalent to trivalent was observed in Rh-doped SrTiO3 prepared at 1473 K, which showed the highest activity for hydrogen evolution. PA measurements revealed the effective redox cycle mechanism between tetravalent and trivalent Rh ions in Rh-doped SrTiO3.

DOI： 10.1039/d0cc06414a

Kyutacar

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Determination of the internal quantum efficiency for photoelectrochemical reaction in a semiconductor photoelectrode by photoacoustic detection 査読有り

Murakami N., Okuzono K.

Chemical Communications 56 ( 40 ) 5417 - 5420 2020年05月

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）

© The Royal Society of Chemistry 2020. We showed for the first time the validity of photothermal measurement for determination of internal quantum efficiency, which is one of the most fundamental parameters for energy conversion systems. The measurement method using photoacoustic detection in the present study can be applied to a wide variety of samples and measurement conditions.

DOI： 10.1039/d0cc01911a

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Nitrogen Fixation in a Plasma/Liquid Interfacial Reaction and Its Switching between Reduction and Oxidation 査読有り

Sakakura T., Murakami N., Takatsuji Y., Haruyama T.

Journal of Physical Chemistry C 124 ( 17 ) 9401 - 9408 2020年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 American Chemical Society. There are multiple active species at the interface between the discharged gas phase and the water phase. Activated nitrogen species are generated in the nitrogen plasma gas by dielectric barrier discharge (DBD). The reaction at the interface between the gas phase containing the activated nitrogen species and water phase (P/L reaction) can produce nitrogen-derived compounds (N-compounds) in water. We have already clarified the mechanism of the P/L reaction focusing on highly active atomic nitrogen in a previous study. In this study, we report the mechanism of the P/L reaction by excited but metastable nitrogen molecules. Involving excited nitrogen molecules [N2(A3ςu+)] with a long lifetime, the reaction selectivity of N-compounds was clarified by quantitative analysis. Moreover, the active species in the water phase (H·, HO·, H2O2) of the P/L reaction were measured, and the involvement of the reaction in the generation of N-compounds was confirmed. The findings clarify that each activated nitrogen species reacts differently with H2O. These results suggest that the occurrence of either an oxidation reaction or a reduction reaction can be regulated by controlling the activated nitrogen species.

DOI： 10.1021/acs.jpcc.0c02392

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Development of Plasmonic Photocatalyst by Site-selective Loading of Bimetallic Nanoparticles of Au and Ag on Titanium(IV) Oxide 査読有り

Zheng Z., Murakami N., Liu J., Teng Z., Zhang Q., Cao Y., Cheng H., Ohno T.

ChemCatChem 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Morphology-controlled rutile titanium(IV) oxide (TiO2) and anatase TiO2 were prepared by a hydrothermal method and their surfaces were selectively loaded with Au, Ag and AuAg bimetallic nanoparticles (NPs) by photo-deposition in order to obtain visible-light responsive photocatalysts. With the help of local surface plasmon resonance (LSPR) of noble metal NPs, the photocatalytic activity of noble metal-loaded TiO2 under visible-light irradiation was improved compared to that of bare TiO2. The enhancement of LSPR on the photocatalytic activity of rutile TiO2 was larger than that of anatase TiO2 with optimum amount of Au or AuAg. In addition, the reusability (stability) of AuAg-loaded TiO2 was much better than that of Ag-loaded TiO2. Double-beam photoacoustic results confirmed different trap energy level distribution lead to different electron transfer ways, resulting in different oxidizing capabilities and they gave one of important strategies for designing visible-light responsive TiO2.

DOI： 10.1002/cctc.202000366

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Photoacoustic Fourier Transform Near- and Mid-Infrared Spectroscopy for Measurement of Energy Levels of Electron Trapping Sites in Titanium(IV) Oxide Photocatalyst Powders 査読有り

Shinoda T., Murakami N.

Journal of Physical Chemistry C 123 ( 19 ) 12169 - 12175 2019年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 American Chemical Society. Electron trapping sites in titanium(IV) oxide photocatalyst powders were investigated by photoacoustic (PA) Fourier transform near-infrared spectroscopy (FT-NIR) and mid-infrared spectroscopy (FT-MIR). PA measurements using FT-NIR and FT-MIR enabled in situ observation of the energy levels of electron trapping sites in wide energy levels (0.1-1.9 eV) below the bottom of the conduction band. During ultraviolet (UV) irradiation, PA intensity increased depending on the wavenumber, and changes in the PA spectra were observed as a result of the trivalent titanium species generated by accumulation of electrons at trapping sites. Moreover, the PA spectral shape during UV irradiation was essentially different between the crystal structures, and it greatly depended on the crystal structure rather than other properties such as specific surface area and particle size. The results for various samples suggest that anatase has shallower energy levels of electron trapping sites than those of rutile and brookite, with the main energy level of the trapping sites being deep in the order of brookite > rutile > anatase. Thus, the PA technique using FT-NIR and FT-MIR is an effective method for measurements of energy levels of electron trapping sites in semiconductor photocatalysts.

DOI： 10.1021/acs.jpcc.9b02876

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Improvement of photocatalytic activity of high specific surface area graphitic carbon nitride by loading a co-catalyst 査読有り

Chen Y., Murakami N., Chen H.Y., Sun J., Zhang Q.T., Wang Z.F., Ohno T., Zhang M.

Rare Metals 38 ( 5 ) 468 - 474 2019年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2014, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg. Graphitic carbon nitride (g-C3N4) was synthesized by heating melamine and was then treated with sodium hydroxide solution under a hydrothermal condition to obtain g-C3N4 with a large specific surface area (HSSA). HSSA shows higher photocatalytic activity for decomposition of acetaldehyde than that of original g-C3N4. HSSA was modified with RuO2 as a co-catalyst by the impregnation method. HSSA loaded with 0.05 wt% RuO2 shows the highest photocatalytic activity for acetaldehyde decomposition under visible light (λ = 455 nm).

DOI： 10.1007/s12598-014-0327-y

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Synthesis of anatase TiO#D2#DR with exposed {001} and {101} facets and photocatalytic activity 査読有り

Sun J., Zhang M., Wang Z.F., Chen H.Y., Chen Y., Murakami N., Ohno T.

Rare Metals 38 ( 4 ) 287 - 291 2019年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2014, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg. Anatase titanium(IV) oxide (TiO2) particles with exposed {001} and {101} facets were prepared by hydrothermal treatment of amorphous TiO2 with H2O2–NH3 solution. Crystal phase, shape, and size of TiO2 particles are found to be greatly dependent on the ratio of H2O2–NH3 solution. The prepared TiO2 particles with specific exposed crystal faces show higher photocatalytic activity for acetaldehyde decomposition than commercial spherical TiO2 particles. This result implies that recombination is prevented by spatial separation of redox sites in the particles because of selective migration of electrons and positive holes to specific exposed crystal faces and/or different reactivity of electrons and positive holes on the specific exposed crystal face.

DOI： 10.1007/s12598-014-0329-9

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Contribution of Discharge Excited Atomic N, N#D2#DR*, and N#D2#DR#U+#UR to a Plasma/Liquid Interfacial Reaction as Suggested by Quantitative Analysis 査読有り

Sakakura T., Murakami N., Takatsuji Y., Morimoto M., Haruyama T.

ChemPhysChem 20 1467 - 1474 2019年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Electric-discharge nitrogen comprises three main types of excited nitrogen species-atomic nitrogen (N atom ), excited nitrogen molecules (N 2 *), and nitrogen ions (N 2+ ) – which have different lifetimes and reactivities. In particular, the interfacial reaction locus between the discharged nitrogen and the water phase produces nitrogen compounds such as ammonia and nitrate ions (denoted as N-compounds generically); this is referred to as the plasma/liquid interfacial (P/L) reaction. The N atom amount was analyzed quantitatively to clarify the contribution of N atom to the P/L reaction. We focused on the quantitative relationship between N atom and the produced N-compounds, and found that both N 2 * and N 2+ , which are active species other than N atom , contributed to P/L reaction. The production of N-compounds from N 2 * and N 2+ was enhanced upon UV irradiation of the water phase, but the production of N-compounds from N atom did not increase by UV irradiation. These results revealed that the P/L reactions starting from N atom and those starting from N 2* and N 2+ follow different mechanisms.

DOI： 10.1002/cphc.201900212

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光音響分光法による光触媒反応の解析

村上直也

化学と教育 ( 公益社団法人日本化学会 ) 67 ( 8 ) 342 - 345 2019年01月

担当区分：責任著者記述言語：日本語掲載種別：記事・総説・解説・論説等（学術雑誌）

<p>光音響分光法は，光吸収によって生じた励起種（例えば，励起状態にある電子など）が基底状態に戻る際に放出される熱を，物質の熱膨張によって生じた圧力変化（音波）として検出する手法であり，音の大きさによって光吸収量を評価する。そのため，微粒子の分光測定の際に問題となる光散乱の影響を受けることなく，そのままの状態での測定が可能である。本稿では，光音響分光法の概要と，これを光触媒反応に適用した著者らの取り組みについて紹介する。</p>

DOI： 10.20665/kakyoshi.67.8_342

CiNii Article

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Operando Analysis of Electron Accumulation in Titanium(IV) Oxide Particles in an Aqueous Suspension Using a Photoacoustic Spectroscopic Method 査読有り

Murakami N., Shinoda T.

Journal of Physical Chemistry C 123 ( 1 ) 222 - 226 2018年12月

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）

Copyright © 2018 American Chemical Society. The time course of photoabsorption of an aqueous suspension of titanium(IV) oxide (TiO2) particles was studied using photoacoustic (PA) spectroscopy. In the absence of an electron acceptor and the presence of an electron donor, ultraviolet irradiation increased PA intensity because photoabsorption of the suspension increased due to trivalent titanium (Ti3+) species generated by electron accumulation in TiO2 particles. In contrast, the addition of methylene blue (MB) as an acceptor caused a decrease in PA intensity, indicating that accumulated electrons were consumed by reduction of MB to colorless leuco-MB. The results for various TiO2 particles indicated that Ti3+ density is determined by this method. Moreover, the measurement can be applicable to quantitative operando analysis for accumulated electrons in a photocatalytic reaction. ©

DOI： 10.1021/acs.jpcc.8b10566

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Mid-infrared absorption of trapped electrons in titanium(IV) oxide particles using a photoacoustic FTIR technique 査読有り

Murakami N., Shinoda T.

Physical Chemistry Chemical Physics 20 ( 38 ) 24519 - 24522 2018年09月

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 Owner Societies. Mid-infrared absorption of titanium(iv) oxide (TiO2) under ultraviolet (UV) irradiation was studied by Fourier transform infrared spectroscopy using a photoacoustic (PA) technique. UV irradiation induced an upward shift of the PA spectra, which is due to the trivalent titanium (Ti3+) species produced by electron accumulation. The PA spectra under UV irradiation mainly depend on the crystal structure, indicating that the energy levels of Ti3+are largely determined by crystal structures.

DOI： 10.1039/c8cp04885a

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Reversed double-beam photoacoustic spectroscopy of metal-oxide powders for estimation of their energy-resolved distribution of electron traps and electronic-band structure 査読有り

Nitta A., Takashima M., Murakami N., Takase M., Ohtani B.

Electrochimica Acta 264 83 - 90 2018年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Ltd A novel instrumental methodology, reversed double-beam photoacoustic spectroscopy (RDB-PAS), was developed for measuring the energy-resolved distribution of electron traps (ERDT) of metal-oxide powders. In the RDB-PAS measurement, electrons in the valence band of a powder sample are directly excited to electron traps (ETs) and accumulated in the ETs from the deeper (anodic) side to the shallower (cathodic) side by wavelength-scanned continuous light, and the increase in photoabsorption of electron-filled ETs is measured by modulated light at a fixed wavelength by PAS. It was shown that ERDT/CBB (conduction-band bottom) patterns measured by RDB-PAS can be used for not only identification and detailed characterization of a wide range of metal-oxide powder samples but also estimation of difference in apparent valence-band top (VBT) position.

DOI： 10.1016/j.electacta.2017.12.160

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光音響分光法による光触媒反応にともなう反応熱の測定

村上直也

光アライアンス ( 日本興業出版 ) 28 ( 3 ) 16 - 19 2017年03月

A fingerprint of metal-oxide powders: energy-resolved distribution of electron traps 査読有り

Akio Nitta, Mai Takase, Mai Takashima, Naoya Murakami, Bunsho Ohtani

Chemical Communications 52 12096 - 12097 2016年09月

In situ photoacoustic FTIR studies on photocatalytic oxidation of 2-propanol over titanium(IV) oxide 査読有り

Naoya Murakami, Nobunori Koga

Catalysis Communications 83 1 - 4 2016年08月

In situ photoacoustic spectroscopic analysis on photocatalytic decolorization of methylene blue over titanium(IV) oxide particles 査読有り

Naoya Murakami, Hirotaka Maruno

RSC Advances 6 65518 - 65523 2016年07月

Smooth electron transfer from a photoexcited dye to semiconductor electrode through a swingable molecular interface 査読有り

Yoshiyuki Takatsuji, Tatsuya Sakakura, Naoya Murakami, Tetsuya Haruyama

Electrochemistry 84 390 - 393 2016年06月

Low-temperature preparation of a molybdenum oxide hole collection layer by using a peroxo precursor for polymer solar cells 査読有り

Keisuke Hamada, Sunao Kamimura, Toshiki Tsubota, Naoya Murakami, Teruhisa Ohno

Solar Energy Materials and Solar Cells 143 522 - 528 2015年12月

Fabrication and characterization of a p-type Cu#D3#DRNb#D2#DRO#D8#DR photocathode toward photoelectrochemical reduction of carbon dioxide 査読有り

Sunao Kamimura, Naoya Murakami, Toshiki Tsubota, Teruhisa Ohno

Applied Catalysis B: Environmental 174-175 471 - 476 2015年09月

Attempt of deposition of Ag-doped amorphous carbon film by Ag-cathode DC plasma with CH#D4#DR flow 査読有り

Tsubota T., Kuratsu K., Murakami N., Ohno T.

Journal of Nanoscience and Nanotechnology 15 ( 6 ) 4619 - 4631 2015年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2015 American Scientific Publishers All rights reserved. A simple DC plasma apparatus having large Ag cathode with CH4flow was used for the attempt to prepare Ag-doped amorphous carbon film. As the gaseous source, CH4and the additive (N2or Ar) were used for the plasma process. When N2was the additive, the substrate surfaces after the plasma process were electrical conductor although high electrical resistance. The growth rate of the deposits decreased with increasing the amount of N2, and the deposits contained nitrogen. Although the small amount of silver was detected by XPS, the peak for Ag may not be in the carbon deposit but be in interlayer formed at Ar etching process. When Ar was the additive, the substrate surfaces after the plasma process were also electrical conductor although high electrical resistance. The growth rate of the deposits was almost independent of the amount of Ar, and the deposits contained no argon. The small XPS peaks for Ag may not be in the carbon deposit but be in interlayer formed at Ar etching process. Both the prepared samples had high antibiotic property. The method of this study could be used for the surface reforming with amorphous carbon coating having electrical conductivity and antibiotic property.

DOI： 10.1166/jnn.2015.9759

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84920746867&origin=inward

注目の論文：多核金属分子による人工光合成

村上直也

月刊化学 ( 化学同人 ) 70 63 - 64 2015年01月

Performance of carbon material derived from starch mixed with flame retardant as electrochemical capacitor 査読有り

Toshiki Tsubota, Masaki Morita, Naoya Murakami, Teruhisa Ohno

Journal of Power Sources 267 635 - 640 2014年12月

Synthesis of nanofibrous carbon with herringbone structure on Ni-supported SiC particles using hot CVD apparatus 査読有り

Toshiki Tsubota, Hirofumi Matsuo, Naoya Murakami, Teruhisa Ohno, Hirofumi Yajima

Diamond and Related Materials 48 104 - 109 2014年09月

Photocatalytic reduction of CO#D2#DR over a hybrid photocatalyst composed of WO#D3#DR and graphitic carbon nitride (g-C#D3#DRN#D4#DR) under visible light 査読有り

Teruhisa Ohno, Naoya Murakami, Takahiro Koyanagi, Yin Yang

Journal of CO2 Utilization 6 17 - 25 2014年06月

Photocatalytic reduction of CO#D2#DR over exposed-crystal-face-controlled TiO#D2#DR nanorod having a brookite phase with co-catalyst loading 査読有り

Teruhisa Ohno, Takayoshi Higo, Naoya Murakami, Hirofumi Saito, Qitao Zhang, Yin Yang,Toshiki Tsubota

Applied Catalysis B: Environmental 152-153 309 - 316 2014年06月

Complete oxidation of acetaldehyde over a composite photocatalyst of graphitic carbon nitride and tungsten(VI) oxide under visible-light irradiation 査読有り

Zhengyuan Jin, Naoya Murakami, Toshiki Tsubota, Teruhisa Ohno

Applied Catalysis B: Environmental 150-151 479 - 485 2014年05月

Spherical Activated Carbon Derived from Spherical Cellulose and Its Performance as EDLC Electrode 査読有り

Toshiki Tsubota, Daisuke Nagata, Naoya Murakami, Teruhisa Ohno

Journal of Applied Polymer Science 131 40950 2014年05月

Dependence of Activity of Rutile Titanium(IV) Oxide Powder for Photocatalytic Overall Water Splitting on Structural Properties 査読有り

Kazuhiko Maeda, Naoya Murakami, Teruhisa Ohno

Journal of Physical Chemistry C 118 9093 - 9100 2014年04月

Photocatalytic Reduction of Carbon Dioxide Over Shape-Controlled Titanium(IV) Oxide Nanoparticles with Co-catalyst Loading 査読有り

Naoya Murakami, Daisuke Saruwatari, Toshiki Tsubota, Teruhisa Ohno

Current Organic Chemistry 17 2420 - 2426 2013年11月

Development of highly efficient sulfur-doped TiO#D2#DR photocatalysts hybridized with graphitic carbon nitride 査読有り

Kentaro Kondo, Naoya Murakami, Chen Ye, Toshiki Tsubota, Teruhisa Ohno

Applied Catalysis B: Environmental 142-143 362 - 367 2013年10月

Solution-processed amorphous niobium oxide as a novel electron collection layer for inverted polymer solar cells 査読有り

Keisuke Hamada, Naoya Murakami, Toshiki Tsubota, Teruhisa Ohno

Chemical Physics Letters 586 81 - 84 2013年10月

Bifunctionality of Rh#U3+#UR Modifier on TiO#D2#DR and Working Mechanism of Rh#U3+#UR/TiO#D2#DR Photocatalyst under Irradiation of Visible Light 査読有り

Sho Kitano, Naoya Murakami, Teruhisa Ohno, Yasufumi Mitani, Yoshio Nosaka, Hiroyuki Asakura, Kentaro Teramura, Tsunehiro Tanaka, Hiroaki Tada, Keiji Hashimoto, Hiroshi Kominami

Journal of Physical Chemistry 117 11008 - 11016 2013年05月

光音響分光法による半導体光触媒の評価

村上直也

触媒 ( 触媒学会 ) 55 ( 3 ) 172 - 177 2013年05月

Capacitance property of carbon material derived from starch mixed with guanidine phosphate as electrochemical capacitor 査読有り

Toshiki Tsubota, Taihei Yamaguchi, Chuanshu Wang, Yoshihito Miyauchi, Naoya Murakami,Teruhisa Ohno

Journal of Power Sources 227 24 - 30 2013年04月

Effect of electrochemical treatment in H#D2#DRSO#D4#DR aqueous solution on carbon material derived from cellulose with added guanidine phosphate 査読有り

Toshiki Tsubota, Chuanshu Wang, Naoya Murakami, Teruhisa Ohno

Journal of Power Sources 225 150 - 156 2013年03月

Improvement of visible light responsivity of rutile TiO#D2#DR nanorods by site-selective modification of iron(III) ion on newly exposed faces formed by chemical etching treatment 査読有り

Misa Nakamura, Asami Ono, Eunyoung Bae, Naoya Murakami,Teruhisa Ohno

Applied Catalysis B: Environmental 130-131 264 - 269 2013年02月

ナノ構造制御による酸化チタン光触媒反応場の分離

村上直也，横野照尚

Electrochemistry ( 電気化学会 ) 81 103 - 107 2013年02月

Synthesis of diamond film and UNCD on BeCu substrate by hot filament CVD 査読有り

Toshiki TSUBOTA1), Hiroshi AMANO, Taiki KOJO, Naoya MURAKAMI, Teruhisa OHNO

Journal of the Ceramic Society of Japan 121 187 - 194 2013年02月

Improvement of Electrical Conductivity While Maintaining a High-Transmittance of Graphene Oxide/MWCNT Film by Hydrazine Reduction 査読有り

Shota Mihara, Toshiki Tsubota, Naoya Murakami, Teruhisa Ohno

Journal of Nanoscience and Nanotechnology 12 6930 2012年09月

Improvement of visible light photocatalytic acetaldehyde decomposition of bismuth vanadate/silica nanocomposites by cocatalyst loading 査読有り

Naoya Murakami, Naohiro Takebe, Toshiki Tsubota, Teruhisa Ohno

Journal of Hazardous Materials 211-212 83 - 87 2012年04月

Synthesis of electrical conductive diamond on BeCu alloy for electrical contact of test process in semiconductor fabrication 査読有り

H. Amano, T. Tsubota, N. Murakami, T. Ohno, S. Sawada, T. Suenaga, H. Nagahata

Diamond Related Materials 24 195 - 200 2012年04月

Dependence of photocatalytic activity on particle size of a shape-controlled anatase titanium(IV) oxide nanocrystal 査読有り

Naoya Murakami, Shota Kawakami, Toshiki Tsubota, Teruhisa Ohno

Journal of Molecular Catalysis A: Chemical 2012年03月

Improvement of photocatalytic activity of brookite titanium dioxide nanorods by surface modification using chemical etching 査読有り

Linjie Zhang, Victor M. Menendez-Flores, Naoya Murakami, Teruhisa Ohno

Applied Surface Science 2012年02月

Performance of nitrogen- and sulfur-containing carbon material derived from thiourea and formaldehyde as electrochemical capacitor 査読有り

Toshiki Tsubota, Kaori Takenaka, Naoya Murakami, Teruhisa Ohno

Journal of Power Sources 196 ( 23 ) 10455 - 10460 2011年12月

Controlled structure of anatase TiO#D2#DR nanoparticles by using organic additives in a microwave process 査読有り

Victor M. Menendez-Flores, Misa Nakamura, Tomoki Kida, Zhengyuan Jin, Naoya Murakami, Teruhisa Ohno

Applied Catalysis A: General 406 ( 1-2 ) 119 - 123 2011年10月

Improvement of capacitance value as the electrode of an electrochemical capacitor by mixing starch with guanidine phosphate 査読有り

Toshiki Tsubota, Yoshihito Miyauchi, Naoya Murakami, Teruhisa Ohno

Journal of Power Sources 196 ( 13 ) 5769 - 5773 2011年07月

高指数結晶面の形成による金属ナノ粒子触媒の高活性化

村上直也

触媒 ( 触媒学会 ) 53 ( 4 ) 259 - 259 2011年06月

Chemical modification of diamond surface with linoleic acid by using benzoyl peroxide 査読有り

Toshiki Tsubota, Shota Mihara, Naoya Murakami, Teruhisa Ohno

Diamond and Related Materials 20 ( 4 ) 584 - 587 2011年04月

Photocatalytic reaction over iron hydroxides: A novel visible-light responsive photocatalyst 査読有り

Naoya Murakami,Takuma Matsuo,Toshiki Tsubota,Teruhisa Ohno

Catalysis Communications 12 ( 5 ) 341 - 344 2011年01月

Dependence of photocatalytic activity on aspect ratio of shape-controlled rutile titanium(IV) oxide nanorods 査読有り

Naoya Murakami,Satoshi Katayama,Misa Nakamura,Toshiki Tsubota,Teruhisa Ohno

Journal of Physical Chemistry C 115 ( 2 ) 419 - 424 2010年12月

結晶面選択的鉄イオン担持による可視光応答型酸化チタン光触媒ナノ粒子の開発

村上直也,横野照尚

光化学 ( 光化学協会 ) 41 ( 2 ) 77 - 80 2010年08月

Development of visible-light active S cation-doped TiO#D2#DR photocatalyst 査読有り

Ohno T., Murakami N.

Current Organic Chemistry 14 ( 7 ) 699 - 708 2010年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

Titanium dioxide photocatalysts having anatase and rutile phases are a promising substrate for photodegradation of pollutants in water and air. However, their photocatalytic activities show only under ultraviolet (UV) light. In order to utilize a wide range of incident light such as solar light, development of the photocatalysts whose activities show under visible light is one of the most important strategies. We and other researchers have reported chemically modified titanium dioxide photocatalysts in which S (S4+or S2-) substitutes for some of the lattice titanium atoms. They show rather strong absorption for visible light and high activities for degradation of organic compounds under visible light irradiation. The oxidation state of the S atoms incorporated into the TiO2particles is determined to be mainly S4+from X-ray photoelectron spectra (XPS). In addition, a new method to adsorb Fe3+ions only onto the surface of S cationdoped TiO2is proposed. The photocatalytic activities of Fe3+ions adsorbed on S cation-doped TiO2photocatalysts for oxidation of organic compounds are markedly improved compared to those of S cation-doped TiO2without treatment of Fe3+ions under a wide range of incident light wavelengths, including UV light and visible light. Furthermore, further improvement in their photocatalytic activities of S cation-doped TiO2photocatalysts with Fe3+treated with NaBH4was observed. After the treatment, the crystal structure of Fe3+compounds on S cation-doped TiO2was changed. We also discussed the photocatalytic activity of S cation-doped titania nanotube (TNT) site-selectively loaded with Fe3+compounds under visible light. © 2010 Bentham Science Publishers Ltd.

DOI： 10.2174/138527210790963386

Scopus

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What Are Titania Photocatalysts?-An Exploratory Correlation of Photocatalytic Activity with Structural and Physical Properties 査読有り

Bunsho Ohtani,Orlando Omar Prieto Mahaney,Fumiaki Amano,Naoya Murakami,Ryu Abe

Journal of Advanced Oxidation Technologies 13 247 - 261 2010年07月

Development of a visible-light-responsive rutile rod by site-selective modification of iron(III) ion on {1 1 1} exposed crystal faces 査読有り

Naoya Murakami,Asami Ono,Misa Nakamura,Toshiki Tsubota,Teruhisa Ohno

Applied Catalysis B: Environmental 97 ( 1-2 ) 115 - 119 2010年06月

Effect of chemical etching by sulfuric acid or H#D2#DRO#D2#DR-NH#D3#DR mixed solution on the photocatalytic activity of rutile TiO#D2#DR nanorods 査読有り

Eunyoung Bae,Naoya Murakami,Misa Nakamura,Teruhisa Ohno

Applied Catalysis A: General 380 ( 1-2 ) 48 - 48 2010年05月

光触媒技術の発展と将来展望

村上直也

電気学会誌 ( 電気学会 ) 130 ( 4 ) 234 - 237 2010年04月

Chemical modification of diamond surface with X–(C#D6#DRH#D4#DR)–COOH (X = F, Cl, Br, I) using benzoyl peroxide 査読有り

Toshiki Tsubota, Yuki Kawamura, Naoya Murakami, Teruhisa Ohno

Diamond and Related Materials 19 ( 7-9 ) 1003 - 1006 2010年03月

Control of crystal structure of titanium(IV) oxide by hydrothermal treatment of a titanate nanotube under acidic conditions 査読有り

Naoya Murakami,Taka-aki Kamai,Toshiki Tsubota,Teruhisa Ohno

CrystEngComm 12 532 - 537 2009年11月

Development of a visible-light-responsive titania nanotube photocatalyst by site-selective modification with hetero metal ions 査読有り

Naoya Murakami,Yuichi Fujisawa,Toshiki Tsubota,Teruhisa Ohno

Applied Catalysis B: Environmental 92 ( 1-2 ) 56 - 60 2009年10月

Characterization and photocatalytic performance of carbon nanotube material-modified TiO#D2#DR synthesized by using the hot CVD process 査読有り

Toshiki Tsubota,Asami Ono,Naoya Murakami,Teruhisa Ohno

Characterization and photocatalytic performance of carbon nanotube material-modified TiO2 synthesized by using the hot CVD process 91 ( 1-2 ) 533 - 538 2009年09月

Chemical reaction of hydrogenated diamond surface with amino acids by using N-chlorosuccinimide 査読有り

Toshiki Tsubota,Yuta Hagiwara,Naoya Murakami,Teruhisa Ohno

Diamond & Related Materials 18 ( 9 ) 1174 - 1178 2009年09月

Exposed crystal surface-controlled TiO#D2#DR nanorods having rutile phase from TiCl#D3#DR under hydrothermal conditions 査読有り

Eunyoung Bae,Naoya Murakami,Teruhisa Ohno

Journal of Molecular Catalysis A: Chemical 300 ( 1-2 ) 72 - 79 2009年03月

Novel hydrothermal preparation of pure brookite-type titanium(IV) oxide nanocrystal under strong acidic conditions 査読有り

Naoya Murakami,Taka-aki Kamai,Toshiki Tsubota,Teruhisa Ohno

Catalysis Communications 10 ( 6 ) 963 - 966 2009年02月

Correlation between Photocatalytic Activities and Structural and Physical Properties of Titanium(IV) Oxide Powders 査読有り

Orlando-Omar Prieto-Mahaney,Naoya Murakami,Ryu Abe,Bunsho Ohtani

Chemistry Letters 38 ( 3 ) 238 - 239 2009年01月

Shape-Controlled Anatase Titanium(IV) Oxide Particles Prepared by Hydrothermal Treatment of Peroxo Titanic Acid in the Presence of Polyvinyl Alcohol 査読有り

Naoya Murakami,Yu Kurihara,Toshiki Tsubota,Teruhisa Ohno

Journal of Physical Chemistry C 113 ( 8 ) 3062 - 3069 2009年01月

Development of an S-doped titania nanotube (TNT) site-selectively loaded with iron(III) oxide and its photocatalytic activities 査読有り

Kazumoto Nishijima,Yuichi Fujisawa,Naoya Murakami,Toshiki Tsubota,Teruhisa Ohno

Applied Catalysis B: Environmental 84 ( 3-4 ) 584 - 590 2008年12月

Development of metal cation compound-loaded S-doped TiO#D2#DR photocatalysts having a rutile phase under visible light 査読有り

Teruhisa Ohno,Naoya Murakami,Toshiki Tsubota,Hitoshi Nishimura

Applied Catalysis A: General 349 ( 1-2 ) 70 - 75 2008年10月

Switching Redox Site of Photocatalytic Reaction on Titanium(IV) Oxide Particles Modified with Transition Metal Ion Controlled by Irradiation Wavelength 査読有り

Naoya Murakami,Tetsuo Chiyoya,Toshiki Tsubota,Teruhisa Ohno,"Switching Redox Site of Photocatalytic Reaction on Titanium(IV) Oxide Particles Modified with Transition Metal Ion Controlled by Irradiation Wavelength

Applied Catalysis A: General 348 ( 1 ) 148 - 152 2008年09月

Pristine Simple Oxides as Visible Light Driven Photocatalysts: Highly Efficient Decomposition of Organic Compounds over Platinum-Loaded Tungsten Oxide 査読有り

Ryu Abe,Hitoshi Takami,Naoya Murakami,Bunsho Ohtani

Journal of American Chemical Society 130 ( 25 ) 7780 - 7781 2008年05月

光音響分光法による光触媒反応のその場分析

村上直也,横野照尚,大谷文章

光化学 ( 光化学協会 ) 39 ( 1 ) 37 - 40 2008年05月

Development of titania nanotube (TNT) loaded site-selectively with Pt nanoparticles and their photocatalytic activities 査読有り

Kazumoto Nishijima,Takayuki Fukahori,Naoya Murakami,Toshiki Tsubota,Teruhisa Ohno

Applied Catalysis A: General 337 ( 1 ) 105 - 109 2008年03月

In situ observation of photocatalytic reaction by photoacoustic spectroscopy: Detection of heat of exothermic photocatalytic reaction 査読有り

Naoya Murakami,Ryu Abe,Bunsho Ohtani

Chemical Physics Letters 451 ( 4-6 ) 316 - 320 2008年01月

Photoacoustic spectroscopic estimation of electron mobility in titanium(IV) oxide photocatalysts 査読有り

Naoya Murakami,Ryu Abe,Orlando Omar Prieto Mahaney,Tsukasa Torimoto,Bunsho Ohtani

Studies in Surface Science and Catalysis 172 429 - 432 2007年11月

Incident light dependence for photocatalytic degradation of acetaldehyde and acetic acid on S-doped and N-doped TiO#D2#DR photocatalysts and their reaction mechanisms 査読有り

Kazumoto Nishijima,Bunsho Ohtani,Xiaoli Yan,Taka-aki Kamai,Tetsuo Chiyoya,Naoya Murakami,Teruhisa Ohno

Chemical Physics 339 ( 1-3 ) 64 - 72 2007年10月

二重励起光音響分光法による酸化チタン光触媒の過渡吸収評価

村上直也,大谷文章,横野照尚

未来材料 ( エヌ・ティー・エス ) 10 44 - 49 2007年10月

Double-Beam Photoacoustic Spectroscopic Studies on Transient Absorption of Titanium(IV) Oxide Photocatalyst Powders 査読有り

Naoya Murakami,Orlando Omar Prieto Mahaney,Ryu Abe,Tsukasa Torimoto,Bunsho Ohtani

Journal of Physical Chemistry C 111 ( 32 ) 11927 - 11935 2007年07月

Photocatalytic hydrogen or oxygen evolution from water over S, or N-doped TiO#D2#DR under visible light 査読有り

Kazumoto Nishijima,Toshiki Tsubota,Taka-aki Kamai,Tetsuo Chiyoya,Naoya Murakami,Teruhisa Ohno

International Journal of Photoenergy 2008 1 - 7 2007年05月

Photoacoustic spectroscopic analysis of photoinduced change in absorption of titanium(IV) oxide photocatalyst powders: A novel feasible technique for measurement of defect density 査読有り

Naoya Murakami,Orlando Omar Prieto Mahaney,Tsukasa Torimoto,Bunsho Ohtani

Chemical Physics Letters 426 ( 1-3 ) 204 - 208 2006年07月

Photocarrier transport in undoped microcrystalline silicon studied by the modulated photocurrent technique 査読有り

Kiminori Hattori,Yoshitaka Musa,Naoya Murakami,Naoki Deguchi,Hiroaki Okamoto

Journal of Applied Physics 94 ( 8 ) 5071 - 5082 2003年10月

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