基于表面等离激元催化反应现场构建分子结及谱学研究

项目名称： 基于表面等离激元催化反应现场构建分子结及谱学研究

项目编号： No.21473118

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 有机化学

项目作者： 姚建林

作者单位： 苏州大学

项目金额： 88万元

中文摘要： 分子器件模型构建及高灵敏度表征技术一直是分子电子学的研究热点。本项目结合分子电子学中金属-分子-金属模型异质结的优势以及SERS 光谱高灵敏度的特点， 通过构建基于机械可控裂结(MCBJ)技术的分子电子学测试以及SERS 检测的联用平台，开展基于等离激元催化偶联反应现场构筑分子结及等离激元诱导催化反应机理的研究。利用MCBJ 技术调控纳米金属间隙并采用等离激元诱导催化反应偶合两端分子形成分子结，开展电导的动态测量和统计，实现间隙内少数分子催化偶联反应过程的研究；借助间隙巨大的热点效应，采用SERS 光谱研究分子结内分子的微观结构，反应动力学等信息，并关联电学测量与SERS 测量结果，解析表面等离激元诱导催化反应机理，发展基于表面等离激元催化反应的现场构筑分子结的新方法，拓展SERS 技术成为分子电子学的高灵敏度表征工具。

中文关键词： 分子结；表面增强拉曼散射；表面等离激元；催化；偶联反应

英文摘要： The construction of the molecular device model and the development of characterization technique with high sensitivity have attracted considerable attention in the field of molecular electronic device. This project will attempt to develop the advantages of metal-molecule-metal and the surface enhanced Raman spectroscopy (SERS). By establishing the platform combined with the SERS detection and the molecular electronic measurements under the mechanically controllable break junction (MCBJ) control, the in situ construction and characterization of molecular junction will be investigated based on the plasmon induced catalysis as well as the exploration of the reaction mechanisms. The metal gap distance will be controlled by MCBJ technique for the formation of molecular through the link of the molecule produced by the plasmon catalyzed coupling reaction of two molecules attached the two sides of the metal gap. By controlling the amounts of molecule located in the gap, the conductance will be measured and made a statistics to obtain the single molecular conductance and the dynamics of single molecular catalysis reaction. By assisted with the huge ―hot spot effect in the metal gap, SERS was employed to investigate the molecular structure, reaction dynamics in the metal gap. The electric measurements will be associated with the in situ SERS detection. It will be beneficial to provide the experimental basis for the development of novel method in the construction of molecular junction based on plasmon induced catalysis, and SERS will be considered as one of powerful tolls for charactering the nature of the molecular junction. Finally, SERS combined with the molecular junction will be developed as a tool for exploring the mechanisms of plasmon induced catalysis with high spatial resolution and sensitivity.

英文关键词： molecular junction;surface enhanced Raman spectroscopy;surface plasmon;catalysis;coupling reaction