Plasma Emission and Surface Reduction of Titanium Dioxides by Microwave Irradiation
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概要
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We present a systematic study of the microwave irradiation effects on TiO2 under vacuum in order to distinguish between the mechanisms of microwave and conventional thermal reductions, while paying particular attention to the changes in structural and optical properties of a sample. We observe the grain surface reduction of a sample through oxygen atomic plasma emission during an intensive absorption of microwave under vacuum without any reducing agent and obtained a dark-colored solid specimen after such emission. Reflectance spectroscopy, resistance measurement and emission spectroscopy confirm that the TiO2 grain surface is directly reduced to a lower-oxygenated condition while emitting oxygen atomic plasma by microwave irradiation under vacuum. This is different from thermal reduction. Possible mechanisms of microwave plasma emission and grain surface reduction are also presented.
- 2009-11-25
著者
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Mitani Tomohiko
Research Institute For Sustainable Humanosphere (rish) Kyoto University
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Yoshikawa Susumu
Institute Of Advanced Energy Kyoto University
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Sonobe Taro
Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
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Hachiya Kan
Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Shinohara Naoki
Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Sonobe Taro
Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Mitani Tomohiko
Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Yoshikawa Susumu
Institute of Advanced Energy (IAE), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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