Synthesis, Structure and Growth Mechanism of Size and Shape Tunable Au/Ag Bimetallic Nanoparticles
By simply adding ascorbic acid in advance of AgNO_3, the size and shape controllable Au/Ag bimetallic nanoparticles (NP) were prepared in the traditional Au growth solution free of seed at room temperature. The size distribution of NP is well uniform with ca. 10%-15% standard deviation in diameter. By changing CTAB concentration, the size and shape of NPs are tunable. After researching the surface-enhanced Raman spectroscopy (SERS) behavior of the prepared NPs, an enhancement factor varied from 4.3×10~4 to 1.1×10~5 was obtained for the NP centered at ca. (64±8) nm. Electrochemical cyclic voltammetric results revealed that the so formed nanoparticles were Au riched Au/Ag bimetallic NP, and this formation might be due to the disproportionation reaction of Au~+ prompted by Ag~+ and the under potential deposition process of Ag~+ on Au.
作 者： ZHENG, Pengcheng HU, Juan SHEN, Guoli JIANG, Jianhui YU, Ruqin LIU, Guokun 作者单位： State Key Laboratory of ChemlBiosensing and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha, Hunan 410082, China 刊 名： 中国化学（英文版） SCI 英文刊名： CHINESE JOURNAL OF CHEMISTRY 年，卷(期)： 2009 27(11) 分类号： O6 关键词： Au/Ag bimetallic nanoparticle CTAB surface-enhanced Raman spectroscopy (SERS)