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）吸附在玻璃板的表面上，当在应用外部电场的应用下辐照白光时溶解在纯净水中。通过更改吸收光谱监测溶解。结构表征表明，由于治疗的结果，玻璃上的Ag纳米颗粒数量减少。但是，颗粒的大小增加到大约。处理后80 nm。结构的变化速率取决于辐照的光强度和外部电场的存在。结果表明，溶液中Ag纳米颗粒的电偏振相结合会导致吸附在玻璃板上的Ag纳米颗粒的结构变化。这些变化归因于金属溶解/沉积在Ag纳米颗粒表面上的高度局部电化学反应。Cu，Ag，Ni，Pd和Pb的金属纳米连接是通过在GAP上在GAP上的电化学蚀刻或沉积方法成功制造的。溶液中可持续的薄金线。在Cu，Ag，Ni和Pd的接触中，显而易见的是表现出单位值的电导量化的相对稳定的行为。与其他金属相比，PB接触的电导量化行为相当不稳定。在当前系统中，首次观察到室温下溶液中Ni，Pd和Pb纳米接触的电导量化。