1994 Fiscal Year Annual Research Report

半導体上におけるRu錯体の光触媒機能材料発現と人工光合成系への応用

Research Project

Project/Area Number	06227216
Research Institution	The University of Tokyo
Principal Investigator	藤嶋昭東京大学, 工学部, 教授 (30078307)
Co-Investigator(Kenkyū-buntansha)	馬場凉東京大学, 工学部, 助手 (70198951) 橋本和仁東京大学, 工学部, 助教授 (00172859)
Keywords	ルテニウム錯体、 / 半導体光触媒 / 光エネルギー変換 / 機能性薄膜 / ハイブリッドシステム / Ti-テトライソプロポキシド / 人工光合成系
Research Abstract	1、有機金属錯体を出発原料とした高活性酸化チタン薄膜の開発高効率な光エネルギー変換系、光触媒系の構築のための理論的検討を行なった結果、反応気質の供給律速や環境光スペクトルの実測値を考慮すればミクロン程度の膜厚の透明な半導体薄膜が応用上重要であることを示すことができた。そこで、Ti-テトライソプロポキシドを出発原料として噴霧熱分解法、CVD法、およびゾルゲル法により酸化チタン薄膜を作製し、それらの光触媒薄膜をアセトアルデヒドの光触媒分解反応に基づいて活性評価し、製膜法の最適化を図ることにより平滑透明でしかも活性標準光触媒であるP25粉末を凌ぐ高活性な光触媒薄膜の開発に成功した。 2、半導体表面のハイブリッド修飾法の検討 Ru錯体による表面修飾と平行して、還元反応を促進し正味の光触媒活性を向上させる貴金属修飾について検討した。その中で、金属イオンの吸着特性や錯化剤による残存金属イオンの除去、あるいは担持金属の密着強度の検討を通じて、従来の無電解めっき法に代る新規な光ファインパタ-ニングの実用レベルの技術を確立することができた。 3、炭酸ガス還元をモデル系とした光触媒機能の高効率発現に向けた電気化学的検討新規に開発する有機金属/半導体材料複合系を用いて炭酸ガスの還元への応用を試みるための予備的検討として、金属電極による炭酸ガスの電気化学的還元を加圧条件下あるいは重水中で行い、従来の報告に比べはるかに大きな電流密度の実現と反応機構についての新規な知見を得ることができた。

Research Products
(12 results)

All Other

All Publications (12 results)

[Publications] K.Ohkawa: "Electrochemical Reduction of Carbon Dioxide on Hydrogen-storing Materials: --Part 4.Electrochemical Behavior of the Pd Electrode in Aqueous and Nonaqueous Electrolyte" J.Electroanal.Chem.369. 247-250 (1994)
[Publications] A.Fujishima: "Thin Semiconductor Films:Photoeffects and New Applications" Electrochem.Acta. 39. 1229-1236 (1994)
[Publications] H.Yoshiki: "Electroless Copper Plating Using ZnO Thin Film Coated on a Glass Substrate" J.Electrochem.Soc.141. L56-L58 (1994)
[Publications] Y.Yano: "Observation and Surfaces Modification of Electropolymerized Poly(N-Methylpyrrle) Using Atomic Force Microscopy" J.Vac.Sci.Technol.B,. 12. 1596-1599 (1994)
[Publications] L.A.Nagahara: "Mica Etch Pits as a Height Calibration Source for Atomic Force Microscopy" J.Vac.Sci.Technol.B.12. 1694-1297 (1994)
[Publications] O.Sato: "A Novel Approach to the Polydiacetylene Langmuir-Blodegett Film by the Surface-Specific Optical Third Harmonic Generation Based on the Angular Momentum Conservation Rule" J.Electroanal.Chem.372. 279-281 (1994)
[Publications] Jin-Fang Zhi: "Conjugated Molecular System of Photochromism and Electrochromism. Photoelectrochemical Behavier of Nitrospirobenzopyran at Low Temperature" Chem.Lett.1521-1524 (1994)
[Publications] L.Jiang: "Surface Photovoltage Spectroscopy and Mapping by Atomic Force Microscopy" Chem.Lett.1975-1978 (1994)
[Publications] X.M.Yang: "In Situ Observation of the Au-Hg Alloy Formation on a Gold Electrode Surface by Atomic Force Microscopy" Chem.Lett.2059-2062 (1994)
[Publications] T.Saeki: "Electrochemical Reduction of Liquid CO_2, ---Drastic Enhancement of Current Density---" J.Electrochem.Soc.141. L130-L132 (1994)
[Publications] H.Sakai,: "Intracellular Ca^<2+> Concentration Change of T24 Cell Under Irradiation in the Presence of TiO_2 Ultrafine Particles" Biochim.Biophys.Acta. 1201. 259-265 (1994)
[Publications] H.Sakai.: "Separate Monitoring of Reaction Products Formed at Oxidation and Reduction Sites of TiO_2 Photocatalysts Using a Microelectrode" J.Electroanal.Chem.379. 199-205 (1995)

1994 Fiscal Year Annual Research Report

半導体上におけるRu錯体の光触媒機能材料発現と人工光合成系への応用

Principal Investigator

藤嶋 昭 東京大学, 工学部, 教授 (30078307)

Research Products

[Publications] K.Ohkawa: "Electrochemical Reduction of Carbon Dioxide on Hydrogen-storing Materials: --Part 4.Electrochemical Behavior of the Pd Electrode in Aqueous and Nonaqueous Electrolyte" J.Electroanal.Chem.369. 247-250 (1994)

[Publications] A.Fujishima: "Thin Semiconductor Films:Photoeffects and New Applications" Electrochem.Acta. 39. 1229-1236 (1994)

[Publications] H.Yoshiki: "Electroless Copper Plating Using ZnO Thin Film Coated on a Glass Substrate" J.Electrochem.Soc.141. L56-L58 (1994)

[Publications] Y.Yano: "Observation and Surfaces Modification of Electropolymerized Poly(N-Methylpyrrle) Using Atomic Force Microscopy" J.Vac.Sci.Technol.B,. 12. 1596-1599 (1994)

[Publications] L.A.Nagahara: "Mica Etch Pits as a Height Calibration Source for Atomic Force Microscopy" J.Vac.Sci.Technol.B.12. 1694-1297 (1994)

[Publications] O.Sato: "A Novel Approach to the Polydiacetylene Langmuir-Blodegett Film by the Surface-Specific Optical Third Harmonic Generation Based on the Angular Momentum Conservation Rule" J.Electroanal.Chem.372. 279-281 (1994)

[Publications] Jin-Fang Zhi: "Conjugated Molecular System of Photochromism and Electrochromism. Photoelectrochemical Behavier of Nitrospirobenzopyran at Low Temperature" Chem.Lett.1521-1524 (1994)

[Publications] L.Jiang: "Surface Photovoltage Spectroscopy and Mapping by Atomic Force Microscopy" Chem.Lett.1975-1978 (1994)

[Publications] X.M.Yang: "In Situ Observation of the Au-Hg Alloy Formation on a Gold Electrode Surface by Atomic Force Microscopy" Chem.Lett.2059-2062 (1994)

[Publications] T.Saeki: "Electrochemical Reduction of Liquid CO_2, ---Drastic Enhancement of Current Density---" J.Electrochem.Soc.141. L130-L132 (1994)

[Publications] H.Sakai,: "Intracellular Ca^<2+> Concentration Change of T24 Cell Under Irradiation in the Presence of TiO_2 Ultrafine Particles" Biochim.Biophys.Acta. 1201. 259-265 (1994)

[Publications] H.Sakai.: "Separate Monitoring of Reaction Products Formed at Oxidation and Reduction Sites of TiO_2 Photocatalysts Using a Microelectrode" J.Electroanal.Chem.379. 199-205 (1995)

藤嶋昭東京大学, 工学部, 教授 (30078307)