High-Yield Seedless Synthesis of Triangular Gold Nanoplates through Oxidative Etching
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- 作者：Lei Chen ; Fei Ji ; Yong Xu ; Liu He ; Yifan Mi ; Feng Bao ; Baoquan Sun ; Xiaohong Zhang ; Qiao Zhang
- 刊名：Nano Letters
- 出版年：2014
- 出版时间：December 10, 2014
- 年：2014
- 卷：14
- 期：12
- 页码：7201-7206
- 全文大小：455K
- ISSN：1530-6992
文摘
We demonstrate that monodispersed triangular gold nanoplates with high morphological yield (>90%) can be synthesized through a rapid one-pot seedless growth process. The edge length of triangular Au nanoplates can be readily tuned between 40 and 120 nm by varying the reaction parameters. Systematic studies reveal that distinct from previous hypothesis that the formation of nanoplates is mainly determined by the selective binding of iodide ions, our results show that iodide ions could have dual functions: it can selectively bind to the Au {111} facets and also selectively remove other less stable shape impurities through oxidative etching by forming tri-iodide ions (I3鈥?/sup>), thus facilitating the formation of nuclei with dominant planar structure. This new synthetic route will not only help to better understand the growth mechanism of triangular gold nanoplates but also promote the research in anisotropic noble metal nanostructures.