关于氯离子对银胶体系SERS效应的进一步增强机理

The Enhanced Mechanism of Cl^- to SERS in Silver Colloid

在一些情况下添加氯离子能引起表面增强拉曼散射的进一步增强 ,本文提出了SERS效应中氯离子在银胶粒子和分子之间搭桥 ,从而促成吸附并引起进一步增强的观点。设计了实验 。

The SERS is enhanced when KCI is added to silver colloid and cation molecule. The hypothesis supposed that Cl- bridged between nano-silver and molecule, as a result the molecule adsorbing on nano-silver surface is promoted and the SERS is therefore enhanced. The CN- and NH3 can be better adsorbed when they are added separately to the nano-silver particles, Cl- and anion molecule. The SERS reduces when CN- and NH3 are added separately to Cl- anion molecule and silver colloid. The result is that the CN- and NH3 are so strong that they have replaced Cl- and anion molecules. Therefore the SERS reduces. This has proved the bridge role of Cl-.