Bimetallic Ag/Au nanoparticles: A low temperature ripening strategy in aqueous solution

被引：50
|
作者：
Ji, Yuetian [1 ]
Yang, Shengchun [1 ,2 ]
Guo, Shengwu [2 ]
Song, Xiaoping [1 ]
Ding, Bingjun [2 ]
Yang, Zhimao [1 ,2 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Sci, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Xian 710049, Shaan Xi, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaan Xi, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2010年 / 372卷 / 1-3期
基金：
中国国家自然科学基金;
关键词：
Bimetallic Au/Ag NPs; Ripening process; Low temperature; AG ALLOY NANOPARTICLES; SILVER NANOPARTICLES; CO OXIDATION; AU; GOLD; SHELL; SHAPE; REDUCTION; EVOLUTION; SIZE;
D O I：
10.1016/j.colsurfa.2010.10.028
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Bimetallic Ag/Au nanoparticles (NPs) with alloyed and core-shell structures were synthesized at a low temperature (75 degrees C) from the preformed gold and silver NPs in aqueous solution. The transmission electron microscope (TEM) mapping images, as well as the evolution of UV/vis spectroscopy, revealed that both the digestive ripening and Ostwald ripening were responsible for the formation of above structures during the heating process. Higher Ag ratios led to the growth of silver shell on the surface of Ag/Au alloy core, while lower Ag ratios tended to the formation of alloy particles. Interparticle diffusion, ligands and chemical potential were presumed to play important roles in the formation of alloyed and core-shell bimetallic Ag/Au NPs. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：204 / 209
页数：6
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