研究者詳細 - 村上　直也

論文 - 村上　直也

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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

Kyutacar

Scopus

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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

Scopus

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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

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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

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