基于Au/SiO_2纳米粒子的结晶紫表面增强拉曼特性研究  

Surface-enhanced Raman Scattering Activities of Crystal Violet Based on Au/SiO_2

作　　者：张浩然[1,2] 满石清[1,2] 

机构地区：[1]暨南大学电子工程系,广州510632 [2]暨南大学纳米化学研究所,广州510632

出　　处：《分析化学》2011年第6期821-826,共6页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.60477015);广东省自然科学基金(No.9151063201000018)资助项目

摘　　要：采用自组装-化学镀法制备了以SiO2为核,Au为壳层的核壳结构纳米粒子(Au/SiO2),以生物染色剂结晶紫为探针分子,研究了Au/SiO2的表面增强拉曼散射(SERS)效应,并考察了Cl-对SERS增强效应的影响。实验表明,Cl-对SERS有明显的增强效果,这主要是由于Cl-的加入使得Au/SiO2发生团聚,产生大量"热点",从而使SERS增强效果进一步加强。以Au/SiO2(5×1010 mL-1)为活性基底,KCl(0.01 mol/L)为额外增强剂,在水溶液中实现了对结晶紫(CV)的痕量检出,最低检测浓度可达到5×10-10mol/L。Nanoparticles Au/SiO2,consisting of a silica core with a gold shell,were prepared by a combination of molecular self-assembly and the subsequent electroless plating of gold.The surface-enhanced Raman scattering（SERS） activities of Au/SiO2 were investigated by employing biological dye,crystal violet（CV）,as the probe molecule.The chloride ion effects on surface-enhanced Raman scattering（SERS） activities of Au/SiO2 were studied.It was found that chloride ion could further enhance the SERS,which mainly arose from the aggregation of Au/SiO2,and a lot of ＂hot spots＂ produced.Au/SiO2（5×1010 mL-1） was used as the active substrate,KCl（0.01 mol/L） as the extra intensifier and the detection limit of crystal violet（CV） in solution was 5×10-10 mol/L.

关 键 词：金纳米粒子 核壳结构 表面增强拉曼光谱 热点 

分 类 号：TB383.1[一般工业技术—材料科学与工程]