Synthesis, Structure and Growth Mechanism of Size and Shape Tunable Au/Ag Bimetallic Nanoparticles |
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Authors: | ZHENG Pengcheng HU Juan SHEN Guoli JIANG Jianhui YU Ruqin LIU Guokun |
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Institution: | 1. State Key Laboratory of Chem/Biosensing and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha, Hunan 410082, China;2. Tel.: 0086‐0731‐88822577;3. Fax: 0086‐0731‐88822577 |
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Abstract: | By simply adding ascorbic acid in advance of AgNO3, 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 4.3×104 to 1.1×105 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. |
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Keywords: | Au/Ag bimetallic nanoparticle CTAB surface‐enhanced Raman spectroscopy (SERS) |
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