Au@Ag双金属纳米粒子制备及其SERS性能

李文鹏， 张永良， 单妍*

(青岛科技大学 材料科学与工程学院，山东 青岛 266042)

摘要： 以金纳米粒子为核，采用柠檬酸钠直接还原法成功制备了Au@Ag核壳结构双金属纳米粒子。用透射电镜对其结构与形貌进行了表征，研究了其紫外可见吸收特性及表面增强拉曼散射(SERS)性能。结果表明：核壳结构在20~30 nm，分散性好；相比于单纯的Au纳米粒子，Au@Ag核壳结构双金属纳米粒子具有较强的紫外可见吸收峰。以4ATP为探针，研究了其表面增强拉曼散射效应，发现该核壳结构对4ATP各个峰位均具有更明显的表面增强拉曼散射效应，特别是在1 000~1 500 cm-1范围内的增强效果明显好于纯金纳米颗粒。

关键词： Au@Ag核壳结构； 柠檬酸钠； SERS

中图分类号： O 657.3                   文献标志码： A

Preparation and SERS Properties of Au@Ag Bimetallic Nanoparticles

 LI Wenpeng, ZHANG Yongliang, SHAN Yan

(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: Au@Ag coreshell bimetallic nanoparticles were successfully prepared with gold nanoparticles as the core, sodium citrate acid as reducer. The structure and morphology of the bimetallic particles were characterized by transmission electron microscopy; also their UVVis absorption properties and surface enhanced Raman scattering effect were investigated，respectively. The results showed that the coreshell Au@Ag nanostructure was monodisperse and with a size of about 20—30 nm. Comparing to pure Au nanoparticles, Au@Ag bimetallic coreshell nanoparticles have a stronger UV absorption peak.The SERS results showed that, they have an obvious SERS effect on 4ATP, they especially showed better SERS from 1 000 cm-1 to 1 500 cm-1.

Key words: Au@Ag coreshell structure; sodium citrate; SERS

 收稿日期： 20131017

基金项目： 国家自然科学基金项目（50902076;51072087）；山东省自然科学基金项目（ZR2011EMM018；ZR2012EMQ00）.

作者简介： 李文鹏(1989—)，女，硕士研究生.             *通信联系人.