Investigation of Electron-Transfer Process on Photoexcited Heterogeneous Interface and Its New Application

光激发异质界面电子转移过程研究及其新应用

• 批准号: 63470064
• 负责人: FUJISHIMA Akira
• 金额: $ 3.97万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63470064/
• 关键词: semiconductor electrode; scanning tunneling microscopy; TiO_2; electron transfer

It is important to investigate the mechanism of reactions on photoexited semiconductor. In this study, we have employed STM (scanning tunneling microscopy) and a dynamic potential pulse technique as new methods. The following results have been obtained. (1) We built a STM instrument specially designed for observation of semicondoctor-solution interface. A preliminary observation gave an atomic image of HOPG. High-quality images Of MoS_2 was also obtained by STM. (2) A dynamic potential pulse technique has been used to explore the controlling factors of the charge transfer mechanism at semiconductor/electrolyte junction. Potential pulses were applied in the order of nanoseconds to a n-SiC single crystal electrode in various redox electrolytes. (3) High resolution images were obtained on heterogenious interface by a new method of photoelectro chemistry. (4) Activity of photochemical reaction on the photoexcited surface of a semiconductor was applied to kill cancer cells. A typical cancer cell, HeLa cell was killed by photoexcited TiO_2 ultrafine particles. TiO_2 particles modified by hematoporphyrine also showed a good activity.

研究光激发半导体上的反应机理具有重要意义。在这项研究中，我们采用了STM（扫描隧道显微镜）和动态电位脉冲技术作为新的方法。取得了以下结果。(1)我们建立了一个专门设计用于观察纳米粒子-溶液界面的STM仪器。初步的观察给出了HOPG的原子图像。用扫描隧道显微镜也获得了MoS_2的高质量图像。(2)采用动态电位脉冲技术研究了半导体/电解质结电荷转移机制的控制因素。在各种氧化还原电解质中，将纳秒量级的电位脉冲施加到n-SiC单晶电极。(3)采用一种新的光电化学方法获得了异质界面的高分辨率图像。(4)半导体光激发表面的光化学反应活性被用来杀死癌细胞。HeLa细胞是一种典型的癌细胞，光激发的TiO_2超微粒子能杀死HeLa细胞。血卟啉修饰的TiO_2粒子也表现出良好的活性。

项目成果

K.Itoh: J.Am.Chem.Soc.110. 6267-6269 (1988)

K.Itoh：J.Am.Chem.Soc.110。

S. Yamagata, R. Baba and A. Fujishima: "Photocatalytic Decomposition of 2-Ethoxyethanol on Titanium Dioxide" Bull. Chem. Soc. Japan, 62 (4), 1004-1010 (1989).

S. Yamagata、R. Baba 和 A. Fujishima：“二氧化钛上 2-乙氧基乙醇的光催化分解”公牛。

A.Aruchamy: "Photoanodic Behaviour of Cu_2O Corrosion Layers on Copper Electrdes" J.Electroanal.Chem.273. 125-136 (1989)

A.Aruchamy：“铜电极上 Cu_2O 腐蚀层的光阳极行为”J.Electroanal.Chem.273。

K.Kobayakawa: "Photoanodic Dissolution of n-Type Cu_2O Film" Denki Kagaku. 57. 1217-1218 (1989)

K.Kobayakawa：“n 型 Cu_2O 薄膜的光阳极溶解”Denki Kagaku。

C.M.Braun: "Charge Fields in Bi_<12>GeO_<20> and Dynamic Flat-band Potential" J.Appl.Phys.63. 5756-5760 (1888)

C.M.Braun：“Bi_<12>GeO_<20> 中的电荷场和动态平带电势”J.Appl.Phys.63。