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ELECTROCHEMICAL CONTORL OF SIGLE ELECTRON TRANSFER AT INTERFACES IN SOLUTION

溶液界面单电子转移的电化学控制

基本信息

批准号：
12440198
负责人：
MURAKOSHI Kei
金额：
$ 2.11万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440198/
关键词：
surface modification metal nano-cluster scanning tunneling microscope surface plasmon conductance quantization electroless plating near field photo-modulated STM 電界メッキ

项目摘要

Ag nanoparticles(d = ca. 20 nm) adsorbed on the surface of a glass plate immersed in pure water dissolved when white light was irradiated under application of an external electric field. Dissolution was monitored via change in absorption spectrum. Structural characterization revealed that the number of Ag nanoparticles on the glass decreased as a consequence of the treatment. The size of the particles, however, increased to ca. 80 nm following the treatment. The rate of change in the structure was dependent on both the irradiated light intensity and the existence of an external electric field. The results demonstrate that photo-excitation combined with the electric polarization of Ag nanoparticles in solution leads to structural changes in Ag nanoparticles adsorbed on a glass plate. The changes were attributable to the highly localized electrochemical reactions of metal dissolution/deposition on the surface of the Ag nanoparticles.Metal nano-contacts of Cu, Ag, Ni, Pd and Pb were successfully fabricated via the electrochemical etching or deposition method at a gap of a sustainable thin gold wire in solution. Relatively stable behaviors of the conductance quantization exhibiting a unit value were apparent at the contacts of Cu, Ag, Ni, and Pd. Conductance quantization behavior of the Pb contact was rather unstable in comparison with other metals. The conductance quantization of Ni, Pd and Pb nano-contacts in solution at room temperature was observed for the first time in the present system.

Ag纳米颗粒（d = ca. 20 nm）吸附在浸入纯水中的玻璃板的表面上，当在施加外电场的情况下照射白色光时溶解。通过吸收光谱的变化监测溶出度。结构表征表明，玻璃上的银纳米粒子的数量减少作为治疗的结果。然而，颗粒的尺寸增加到约100 μ m。80 nm，治疗后。结构的变化率取决于照射光强度和外部电场的存在。结果表明，光激发结合溶液中银纳米粒子的电极化导致银纳米粒子吸附在玻璃板上的结构变化。通过电化学腐蚀或沉积方法，在溶液中可持续的细金线间隙处成功制备了Cu、Ag、Ni、Pd和Pb的金属纳米接触。表现出单位值的电导量子化的相对稳定的行为是明显的Cu，Ag，Ni和Pd的接触。与其他金属相比，Pb接触的电导量子化行为是相当不稳定的。在本系统中首次观察到了室温下溶液中Ni、Pd和Pb纳米接触的电导量子化。