乙腈非水体系中二甲基亚砜和咪唑的表面增强拉曼光谱研究

Study on Surface Enhanced Raman Spectroscopy of DMSO and Imidazole at Silver Electrode in Acetonitrile Solution

利用共焦显微拉曼系统研究了在乙腈非水体系中 ,二甲基亚砜 (DMSO)与乙腈的竞争吸附 ,同时研究了咪唑在非水乙腈体系中的吸附情况 .结果表明 :在非水乙腈溶液中存在着明显的竞争吸附现象 ,咪唑和二甲基亚砜较乙腈分子在银电极上优先吸附 ,明显抑制了乙腈分子的吸附 ,随着电位负移 ,咪唑或二甲基亚砜逐渐脱附 。

By utilizing SERS (surface-enhanced Raman spectroscopy) technique and a confocal microprobe Raman system, the competitive adsorption of dimethylsulphoxide (DMSO) molecule or imidazole molecule was investigated in the acetonitrile solution at silver electrode. It was found that DMSO or imidazole molecule had more preferential adsorption than acetonitrile. Ibis competitive adsorption significantly inhibits the decomposition reaction of acetonitrile. When the potential became more negative, DMSO or imidazole was desorbed gradually and the decomposition reaction of acetonitrile occurred.