2011 Fiscal Year Final Research Report
An ESR study of reaction processes of charge carriers on nanocrystalline TiO_2 surface induced by sub-band gap illumination
| Project/Area Number |
21550190
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Hiroshima University |
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Principal Investigator |
KOMAGUCHI Kenji 広島大学, 大学院・工学研究院, 准教授 (80291483)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 二酸化チタン / 可視光誘起電子移動反応 / 電子スピン共鳴法 / 捕捉電子 |
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| Research Abstract |
Electron transfer reactions on the surface of TiO_2 nanocrystalline particles under visible light illumination have been studied by ESR technique. In the partially reduced TiO_2, it was found that photoinduced electron-transfer reactions between O_2. and Ti^3+ proceed reversibly on the surface. In slurry systems, on the other hand, where 1-naphthol adsorbed on the nanocrystalline TiO_2 surface in 2-Propanol, Ti^3+ was formed on the surface under sub-band gap illumination, accompanied by specific photoresponses. Furthermore, the influence of the intermolecular distance of dyes and co-adsorbed dispersants on TiO_2 photoanodes on dye-sensitized photovoltaic performances was elucidated.
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