少量KCl引起水杨酸表面增强喇曼散射谱的异常变化

本文报道KCl引起的银胶中水杨酸(C₇H₄O₃)表面增强喇曼散射谱(SERS)的异常变化。发现KCl造成水杨酸分子中某些结构的SERS强度急剧而迅速下降,但同时又造成3436cm^-1附近v(—OH)振动的SERS信号的进一步增强。还研究了KCl对一系列含—COOH结构的分子(例如苯甲酸、对氨基苯甲酸等)SERS信号的影响,发现Cl^-对v(—COO^-)振动的SERS强度有明显的 关键词：

ABNORMAL CHANGES IN SERS OF SALICYLIC ACID ADSORBED ON COLLOIDAL SILVER AFTER ADDING KC1

The abnormal changes in SERS of salicylic acid adsorbed on colloidal silver caused by adding KC1 are reported in this article. It was found that the SERS of some vibrational modes corresponsing to certain structures in salicylic acid were reduced rapidly. However, only the SERS intensity of v(-OH) vibration near 3436cm^-1 incresed further because of KC1 addition. Also the influence of adding KC1 on SERS signals of a series of molecules including -COOH structure such as p-aminobenzoic acid, benzoic acid etc., were investigated. It was shown that Cl^- could obviously weaken the SERS intensity of those molecules adsorbed on silver colloid. Both the phenomena have been discussed, and were compared with the case of pyriline. The results of transmission electron micriscopy observation and UV-visible spectral. experiments showed the agreement with the above conclusion.