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苯丙氨酸银溶胶表面增强拉曼光谱的研究
引用本文:刘文涵,杨未,张丹.苯丙氨酸银溶胶表面增强拉曼光谱的研究[J].光谱学与光谱分析,2008,28(2):343-346.
作者姓名:刘文涵  杨未  张丹
作者单位:1. 浙江工业大学化学工程与材料学院,浙江,杭州,310014
2. 浙江工业大学化学工程与材料学院,浙江,杭州,310014;中华人民共和国盐城出人境检验检疫局,江苏,盐城,224002
基金项目:浙江省应用化学重中之重学科开放基金
摘    要:研究了银溶胶与L-苯丙氨酸溶液体系的表面增强拉曼光谱(SERS),增强效果明显,L-苯丙氨酸在银溶胶中的SERS光谱与苯丙氨酸固体常规拉曼光谱相比,主要峰位置基本一致,但某些峰发生了频移,相对强度也发生了一定变化。探讨了三种不同的激发光源对SERS光谱强度的影响。用不同光源测定,其SERS光谱图中各峰位置基本不变,但峰强度有明显变化。在实际工作中应根据需要选择合适的光源,一般情况下以514.42nm为佳。不同浓度的苯丙氨酸在银溶胶中产生的表面增强拉曼光谱有明显的差别,浓度太大或太小都不利于SERS光谱的产生,溶液浓度在1×10-3mol.L-1时SERS最强,增强效果最好。体系的pH对增强效应亦有较大的影响,在pH为8时增强效应最强,这是pH对银溶胶的凝聚状态和苯丙氨酸分子存在状态综合影响的结果。

关 键 词:激光拉曼光谱  苯丙氨酸  表面增强拉曼光谱  银溶胶
文章编号:1000-0593(2008)02-0343-04
收稿时间:2006-10-20
修稿时间:2007-01-16

Study on the Surface-Enhanced Raman Spectrum of Phenylalanine on Silver Sols
LIU Wen-han,YANG Wei,ZHANG Dan.Study on the Surface-Enhanced Raman Spectrum of Phenylalanine on Silver Sols[J].Spectroscopy and Spectral Analysis,2008,28(2):343-346.
Authors:LIU Wen-han  YANG Wei  ZHANG Dan
Institution:College of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou 310032, China. liuwh@mail.hz.zj.cn
Abstract:The surface enhanced Raman scattering (SERS) of L-phenylalanine solution system was studied in the present paper. The enhancement effect is obvious. Compared to the conventional Raman spectra of solid phenylalanine, the frequency deviations of some peaks in the SERS spectra were observed, and the relative strengths of some peaks were certainly changed. The influence of three different laser sources on the intensity of SERS spectra is discussed. The 514.42 nm of laser source is the best among the 514.42, 632.81 and 785.18 nm. The intensity of SERS spectra can be changed with the concentration of L-phenylalanine. It does not benefit the formation of SERS spectra when the concentration is too high or too low. When the concentration of bottom solution is 1 x 10(-3) mol x L(-1), the enhancement effect of SERS is the strongest. The pH value of system also has obvious effect on the SERS, and when the pH value is 8, the enhancement effect of SERS is the best. It is the total influence of the pH on the coacervation of the silver sol and existent form of the phenylalanine.
Keywords:Laser Raman spectra  Phenylalanine  Surface enhanced Raman scattering  Silver sol
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