氯化亚锡抑制吡啶分子表面增强拉曼光谱测定中的碳化现象  

Restraining Pyridine from Laser Carbonization by SnCl_2 in the SERS Measurements

作　　者：褚幼萍[1] 陈述[2] 郑菊芳[1] 李则林[2] 

机构地区：[1]浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,浙江金华321004 [2]湖南师范大学化学化工学院,湖南长沙410081

出　　处：《光谱学与光谱分析》2009年第7期1892-1895,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20673103)资助

摘　　要：碳化是表面增强拉曼光谱中难以避免的干扰现象,特别是对于活性有机和生物分子的检测。作为一种最常用的探针分子,吡啶同样也存在碳化的问题。然而,作者发现通过引入SnCl2,可以有效地抑制表面增强拉曼光谱测定中吡啶分子的碳化现象。该方法操作简单,所引入的SnCl2只在谱图低波段处出现少而易区分的特征峰,不干扰被测样品的光谱分析。有别于文献中所采用的真空、惰性气氛、低温和低激光功率等物理方法,此法是解决碳化问题的一种崭新的化学方法,可望应用于其他易碳化的有机和生物分子的表面增强拉曼光谱检测。Laser carbonization is an inherent problem frequently encountered in the measurements of surface-enhanced Raman scattering （SERS）, especially for the reactive molecules. Pyridine （Py） is one of such examples though it is a common molecule as probe in the SERS studies. The introduction of SnCl2, which has few Raman peaks at low frequency, effectively restrains the pyridine from carbonization. The findings here provide a new convenient chemical way to improve the routine SERS analysis of reactive organic/bio-molecules instead of physical ones reported in the literature like vacuum, inert atmosphere, low temperature, low laser power, and so on. It is expected that this method is also applicable in the SERS study of other vulnerable organic/bio-molecules.

关 键 词：表面增强拉曼光谱 碳化 吡啶 SnCl2 

分 类 号：O664[理学—分析化学]