吡啶羧酸在银电极表面随电极电位变化的表面增强拉曼光谱研究

摘要

The potential-dependent SERS of the three pyridinecarboxylic acids (picolinic acid, isonicotinic acid, and nicotinic acid) on polycrystalline silver electrode are studied in this paper. Their surface geometries may be detected from the high quality potential-dependent SERS signals. With the varying of potential the adsorption behavior of picolinic acid is invariant, while the adsorption behavior of isonicotinic acid and nicotinic acid may change. The probable reasons are given.%本文通过表面增强拉曼散射研究了三种不同构型的吡啶羧酸-皮考酸、异烟酸和烟酸在粗糙银电极表面上的吸附形态随电极电位的变化关系.大量的表面结构信息可从丰富的表面拉曼信号及其随电极电位相应的变化而获得.分析表明在电极电位负移过程中皮考酸分子一直采取通过羧基和苯环上的N原子侧立吸附在银电极表面,与之不同的是,异烟酸分子和烟酸分子在表面的吸附状态都随电位改变发生了变化,我们对此进行了分析和解释.