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。 The effect of adding KCl on silver colloid was studied by transmission electron microscopy. Found that the addition of KCl caused the transport of silver atoms, the colloidal particles become larger, the surface covered with a layer of loose atomic group. At the same time cause colloidal chain aggregation occurred. Compared with the changes of the silver gel caused by the addition of pyridine, it shows that the effects of KCl and pyridine on the silver gel are quite different. The effects of these differences on surface-enhanced Raman scattering signals are also discussed.