乙腈溶液中银电极的表面增强拉曼光谱研究

利用共焦显微拉曼系统研究了非水体系0.1mol·L^-1LiClO4/CH3CN溶液中，乙腈分子在粗糙银和金电极表面的吸附和解离行为。结果表明非水体系中乙腈可在银、金表面发生还原反应，产物CN^-离子与电极表面作用形成的表面配合物可以较宽的电位区间吸附于电极表面。溶液中的微量水、激光照射以及电极电位均对该反应有较大的影响。通过拉曼谱图的比较，得出乙腈分子解离出的CN^-在金电极表面比在银电极表面有更强的吸附作用。

Studies on surface-enhanced raman spectroscopy of silver electrodes in acetonitrile system

By utilizing SERS (surface-enhanced Raman scattering) technique and a confocal microprobe Raman system, the dissociation and adsorption of acetonitrile molecule on the roughened silver and gold electrodes were investigated in non-aqueous acetonitrile system. It is found that at the negative potential acetonitrile molecule can be partially dissociated to cyanide (CN^-), and the complex from the interaction between cyanide and the surface ofthe electrode can be adsorbed on the surface of the electrode over a wide potential range. At the same time, the trace amount of water in the solution, illumination of laser and the electrode potential all have great influence on the decomposition of acetonitrile. By comparing the Raman spectra with each other, it is assumed that the dissociated cyanide of acetonitrile more strongly interacts with the gold electrode than the silver electrode.