Preparation and modification of metal nano-contacts Photo-excitation

金属纳米触点的制备与修饰光激发

基本信息

批准号：
14340219
负责人：
MURAKOSHI Kei
金额：
$ 10.88万
依托单位：
HOKKAIDO UNIVERSITY (2003)Osaka University (2002)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

We have developed novel techniques to control metal structures in the size range less than a few tens nm by combing the effects of photo-irradiation and applying an external electric field. One of the promising applications of metal nanostructures is for single molecular detection employing surface enhanced & Raman scattering (SERS). Although several sophisticated methods were successful with respect to generation of fully reproducible SERS activity, the preparations were often complicated due to the need for specialized synthetic or preparative techniques. Novel facile and controllable techniques to prepare SERS active substrates should be developed. In this study, our technique to control metal nanostructure on glass substrate was used to prepare the films showing very strong SERS signal. Sustainable metal nanocontacts were fabricated under controlled electrochemical potential in solution.Metal nanocontacts of Cu, Ag, Ni, Pd, and Pb were fabricated via the electrochemical etching or deposition method at a gap of sustainable thin Au wires in solution. Relatively stable behaviors of the conductance quantization exhibiting a unit value were apparent at the contacts of Cu, Ag, Ni, and Pd at room temperature. Conductance quantization behavior of the Pb contact was rather unstable in comparison with other metals. echanical stability of Au nanocontact was also examined by controlling electrochemical potential in various solution containing ClO_<4->, S0_4^<2->, Cl^-ions.

我们已经开发了新型技术，可以通过梳理光辐射的影响并应用外部电场来控制小于几十nm的尺寸范围内的金属结构。金属纳米结构的有前途的应用之一是用于使用表面增强和拉曼散射（SER）的单分子检测。尽管几种复杂的方法在产生完全可重现的SERS活性方面取得了成功，但由于需要专门的合成技术或制备技术，制剂通常是复杂的。应开发出新的便捷和可控技术，以制定SERS主动基材。在这项研究中，我们控制玻璃基板上金属纳米结构的技术用于准备表现出非常强烈的SERS信号的膜。可持续的金属纳米接触是在溶液中受控的电化学电位下制造的。通过电化学蚀刻或沉积方法在溶液中可持续的薄AU电线上通过电化学蚀刻或沉积方法制造了Cu，Ag，Ni，Pd和Pb的金属纳米接触。在室温下，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。还通过控制包含clo_ <4->，s0_4^<2->，cl^-ions的各种溶液中的电化学电势来检查Au纳米接触的机械稳定性。