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L-天冬氨酸在银胶体中吸附状态的表面增强拉曼光谱研究
引用本文:朱志良,郜俊影,李风亭,张冰如.L-天冬氨酸在银胶体中吸附状态的表面增强拉曼光谱研究[J].光谱学与光谱分析,2004,24(1):68-70.
作者姓名:朱志良  郜俊影  李风亭  张冰如
作者单位:1. 同济大学化学系,上海,200092
2. 同济大学环境科学与工程学院,上海,200092
基金项目:上海市教育基金会"曙光计划"资助项目
摘    要:利用表面增强拉曼光谱 (Surface EnhancedRamanScattering,SERS)研究了L 天冬氨酸在银溶胶体中的吸附状态及其浓度变化对表面增强拉曼散射效应的影响 ,并探讨了L 天冬氨酸在银溶胶表面的吸附作用特点和规律。实验结果表明 ,L 天冬氨酸在银溶胶中有明显的SERS信号 ,经过分析表明 ,该化合物能够吸附在银表面 ,这种吸附是通过羧基和氨基中的氮原子与银结合来实现的 ,L 天冬氨酸分子中带有负电荷的羧基和氨基中带有孤对电子的氮原子都能与银原子配位 ,其中羧基在银表面的增强为电荷转移机制增强 ,具有化学吸附的特征 ;氨基在银表面的增强为电磁场增强机制 ,为物理吸附。而且SERS强度随着L 天冬氨酸浓度的变化而改变 ,当其浓度为 10 - 3mol·L- 1 时增强效果较好 ,当浓度降低 ,增强作用也逐步变弱

关 键 词:L-天冬氨酸  表面增强拉曼散射  银溶胶  化学吸附  物理吸附
文章编号:1000-0593(2004)01-0068-03
修稿时间:2002年9月26日

The Study of Adsorption of L-aspartic Acid on Silver Sol by Surface-enhanced Raman Scattering
Zhi-liang Zhu,Jun-ying Gao,Feng-ting Li,Bing-ru Zhang.The Study of Adsorption of L-aspartic Acid on Silver Sol by Surface-enhanced Raman Scattering[J].Spectroscopy and Spectral Analysis,2004,24(1):68-70.
Authors:Zhi-liang Zhu  Jun-ying Gao  Feng-ting Li  Bing-ru Zhang
Institution:Department of Chemistry, Tongji University, Shanghai 200092, China.
Abstract:The adsorption state and the characteristics of L-aspartic acid adsorbed on silver sol were studied by the Surface-Enhanced Raman Scattering (SERS) method. Strong Raman signals were detected in the experiments. The results suggested that L-aspartic acid adsorbed on the silver surfaces through carboxyl and nitrogen atoms since the signals were mainly due to the carboxyl and the nitrogen of the molecule of L-aspartic acid. The adsorption of carboxyl on the silver surfaces is chemical adsorption, which is based on the mechanism of charge-transfer, while the adsorption of nitrogen on the silver surfaces is physical type, which is due to the electromagnetic mechanism. The intensity of surface-enhanced Raman scattering of L-aspartic acid adsorbed on silver surface was also analyzed, and it was found that the intensity of surface-enhance Raman scattering will change with different concentrations of L-aspartic acid adsorbed on the silver surfaces. The intensity will reach the top value when the concentration of L-aspartic acid was 10(-3) mol x L(-1). When the concentration of L-aspartic acid decreased to 10(-4) mol x L(-1), the intensity of surface-enhanced Raman scattering became a little weaker than that with 10(-3) mol x L(-1). With further decrease in the concentration of L-aspartic acid, the intensity of surface-enhanced Raman scattering also decreased gradually. When the concentration of L-aspartic acid decreased to 10(-6) mol x L(-1), the intensity of surface-enhanced Raman scattering was very low. The above study will be helpful to the further study of peptide and other complex biological systems.
Keywords:L-aspartic acid  Surface-enhanced Raman scattering  Silver sol  Chemical adsorption  Physical adsorption  
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