Au/Ag核-壳结构复合纳米粒子形成机制的研究  

Formation Mechanism of Core-Shell Au/Ag Nanoparticles

作　　者：纪小会[1] 王连英[1] 袁航[2] 马岚[2] 白玉白[1] 李铁津 

机构地区：[1]吉林大学化学学院,长春130023 [2]云南大学单克隆抗体工程技术研究中心,昆明650091

出　　处：《化学学报》2003年第10期1556-1560,共5页Acta Chimica Sinica

基　　金：国家自然科学基金 (Nos .2 0 0 730 1 6;6 0 2 71 0 2 0 ) 973;863资助项目

摘　　要：在已制备好的Au纳米粒子表面 ,通过化学还原的方法沉积生长Ag包覆层 .通过控制Au ,Ag的比例 ,制备了粒度均匀且粒径可控的Au/Ag核 -壳结构纳米粒子 .利用UV vis吸收光谱和透射电子显微镜 (TEM)对Au,Ag摩尔比为 1∶10的复合纳米粒子的光学性质和形态进行随时监测 ,直接观察了核 -壳结构纳米粒子的生长过程 :一部分Ag+ 在Au核表面还原生长 ,溶液中其余Ag+ 还原形成银的纳米团簇向粒子表面的继续沉积生长 。Core-shell Au/Ag nanoparticles were prepared by deposition of Ag through chemical reduction in the presence of p reformed Au nanoparticles. By changing the molar ratio of Ag to Au, the thickness of the shell and thus the size of bimetallic particles could be controlled in convenient way. In this work, uniformly-sized core-shell Au/Ag nanoparticles were prepared with large amounts of depositing metals until the molar ratio of Ag to Au reaches 1:10. The formation mechanism of the 'core-shell' type nanoparticles was studied by UV-vis spectra, transmission electron microscopy (TEM), etc. A small moiety of silver ions on the surface of gold seeds is reduced. The remaining silver ions in solution are reduced to form nanoclusters. The clusters are deposited on the surface of the particles and the thickness of silver shells increased.

关 键 词：Au/Ag核-壳结构 复合纳米粒子 形成机制 化学还原法 表面催化 

分 类 号：O614[理学—无机化学]