纳米粒子与吸附分子之间电荷转移的影响因素研究

Effecting Factors of Charge Transfer between Nanoparticles in Precious Metals and Surface-Adsorbed Molecules

以对巯基苯胺为探针分子,研究了金、银纳米粒子与吸附分子之间电荷转移的影响因素。表面增强拉曼光谱中,b2振动有较大增强,说明体系中贵金属纳米粒子与吸附分子对巯基苯胺之间的电荷转移增多。研究表明,基底、共吸附卤素离子(Cl-,Br-,I-)以及吸附分子的吸附方式都影响纳米粒子与吸附分子之间的电荷转移行为。

The effecting factors of charge transfer between nanoparticles in precious metals and surface-adsorbed molecules have been studied using Raman spectra in which the p-aminothiophenol was used as the probe molecule. Some b2 vibrations in surface enhanced Raman spectra were found to be enhanced greatly. It suggested that charge transfer between nanoparticles and the p-aminothiophenol molecules should be increased. The results show that charge transfer process is influenced by property and architecture of SERS substrate, co-adsorbed halide ions like CI^-, Br^-, I^- and adsorption mode of adsorbed molecule.