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。
Au@ Ag core-shell bimetallic nanoparticles were successfully prepared with gold nanoparticles as the core, sodium citrate acid as reducer. The structure and mor- phology of the bimetallic particles were characterized by transmission electron microsco- py; 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.
出处
《青岛科技大学学报（自然科学版）》
CAS
2015年第1期43-47,共5页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
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)
关键词
Au@Ag核壳结构
柠檬酸钠
Au@Ag core-shell structure
sodium citrate
SERS
