利用SERS效应研究表面吸附动力学过程

A STUDY OF ADSORPTION DYNAMICS BY SERS

本文提出了利用表面增强喇曼散射(SERS)效应研究表面吸附动力学过程的设想.基于此设想,我们对固-液界面吸附动力学进行了理论探讨,讨论了SERS信号强度随时间的依赖性,从而得到有关表面吸附动力学参量,并利用银胶体系对对氨基苯甲酸的吸附动态过程进行初步实验研究.结果表明,利用SERS效应对表面吸附动力学、尤其是微量吸附动力学的研究是非常有效的.

We proposed a new method to study adsorption dynamics by surface enhanced Raman scattering (SERS). A simple theortical model of adsoption dynamics for solid-liquid interfaces was established. We analysed the time dependence of SERS intensity and further deduced the parameter of adsorption dynamics, such as constant of adsorption speed, adsorption activation energy. As an example, we studied the adsorption dynamics of P-amino-benzoic acid adsorped on the silver colloid. The results show that the faster process of the time dependence of SERS are related to the adsorption process. From the experimental data and our theoretical model, the constant of adsorption speed were deduced. We believe that the study of adsorption dynamics by SERS is very promising.