化学学报 ›› 1994, Vol. 52 ›› Issue (6): 578-587. 上一篇    下一篇

研究论文

阴离子吸附对Ag溶胶光学性质和表面增强拉曼散射的影响

臧泠;刘春艳;任新民   

  1. 中国科学院感光化学研究所
  • 出版日期:1994-06-15 发布日期:1994-06-15

The influence of anion adsorption on the optical property and SERS of Ag Sol

ZANG LING;LIU CHUNYAN;REN XINMIN   

  • Online:1994-06-15 Published:1994-06-15

本文研究了吸附几种不同阴离子(CO~3^2-, OH^-, I^-, Br^-, Cl^-)的Ag溶胶的吸光性质和表面增强拉曼散射(SERS)效应。研究发现, 亲核能力较强的阴离子在胶粒表面有较强的吸附, 并能有效降低胶粒表层的自由电子密度, 从而使Ag溶胶的吸收峰向长波方向移动; 溶胶中产生SERS的机理是阴离子在Ag胶粒表面上的化学吸附, SERS的强度随吸附覆盖度的增大而增大。

关键词: 胶溶作用, 影响因素, 银, 光学性质, 化学吸附, 电子密度, 溶胶, 表面增强拉曼散射, 拉曼光谱法, 离子吸附

The optical property and SERS of Ag sol adsorbed with different anions(CO32-, OH-, I-, Br-, Cl-) have been studied. It was found that the anions with higher nucleophilicity have stronger adsorption on the Ag particles accompanied by that a new absorption peak of Ag sol appeared at longer wavelength, which was caused by the reduction of the free electron d. in the surface layer of the Ag particles. The origin of SERS is attributed to the chemisorption of the anions on the Ag particles. Its intensity increases with increasing surface coverage of adsorption on the Ag particles.

Key words: PEPTIZATION, INFLUENCING FACTORS, SILVER, OPTICAL PROPERTIES, CHEMICAL ADSORPTION, ELECTRON DENSITY, SOL, SURFACE ENHANCED RAMAN SCATTERING, RAMAN SPECTROMETRY

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