KCI对银胶形态影响的电子显微镜研究

借助透射电子显微镜研究了银胶中加入KCl时对银胶的影响。发现KCl的加入引起了银原子的输运,使胶体颗粒变大,表面上覆上一层疏松原子集团。同时引起胶体发生链状凝聚。和加入吡啶引起的银胶的变化做了比较,表明KCl和吡啶对银胶的作用结果有很大差异。同时也讨论了这些差异对表面增强喇曼散射信号的影响。 关键词：

TEM INVESTIGATION ON SILVER SOLS AFTER ADDITION OF KCl

The influence of adding KCI on the silver sols was studied by transmission electron microscopy (TEM). It was found that the Ag atoms on the surfaces of the colloidal silver particles were transported to other positions of the silver surfaces after adding KCI, and the sur-feccs of colloidal silver particles were covered with an atomic group layer which had some kind of structure. At the same time, a chain-like colloidal aggregation in Ag sols was induced by KCI. This was compared with the case of adding pyridine. Also we discussed the effect of adding KCI on the SERS signals of molecules adsorbed on colloidal silver particles.