银胶-分子体系的吸收光谱研究

The Absorption Spectral Study of Silver Sol Molecule System

通过紫外－ 可见吸收光谱研究了作为 Ｓ Ｅ Ｒ Ｓ衬底的银胶体系在不同情况下的光吸收特性，结果表明检测分子及氯离子的加入均会引起银胶的凝聚，在三者共存情况下由于加入检测分子和氯离子的顺序不同，其吸收光谱存在明显的差异并解释了产生这种差异的原因，同时也证实了在银胶体系中存在“热粒子”和“活位”

The absorption characteristics of silver sol molecule system used as SERS substrate was studied by absorption spectrum at different conditions in the article.Both the additions of detedted molecules and haloid ions can result in the aggregation of silver sol.Under the coexist of silver sol,detected molecules and haloid ions,the different adding order of them would result in different absorption spectral characteristics of the system.The results indicate it is reasonable that there are some active sites on silver particle surface and haloid ions can induce more active sites.