借助紫外-可见吸收光谱和共振散射光谱技术, 研究了几种阴离子的加入对“化学纯”银胶的光谱学性质的影响。研究发现, 阴离子的加入会发生离子在银胶表面的吸附和胶体的聚沉作用, 造成等离子体共振吸收的下降和长波区新峰的出现; 同时, 其共振散射峰也发生了规律的变化。比较这些实验现象, 再接合相应的理论分析, 解释了不同的阴离子和胶体间不同的作用方式和造成这些差别的可能原因。

The influence of different anions on “chemical pure” Ag sols have been investigated with UV-vis absorption and resonance scattering spectra. It was found that colloidal aggregation and ionic adsorption occurred when anion was added into sols, thus, a decrease of the plasmon resonance absorption and a much longer-wavelength absorption peak appeared with the corresponding changes of their resonance scattering signals by degrees. Compared with these phenomena and discussed with theoretic analysis, it’s clear that different effect between Ag colloids and anions are existence and thereat caused the different phenomena.