High-Yield Seedless Synthesis of Triangular Gold Nanoplates through Oxidative Etching
High-Yield Seedless Synthesis of Triangular Gold Nanoplates through Oxidative Etching
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DOI：
10.1021/nl504126u
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发表时间：
2014-12-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Qiao
中科院分区：
文献类型：
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作者：
Chen, Lei;Ji, Fei;Zhang, Qiao
我们证明了通过一锅无籽快速生长工艺可以制备出高形态产率(~gt；90%)的单分散三角金纳米板。通过改变反应参数，可以很容易地在40~120 nm之间调节三角形Au纳米片的边缘长度。系统的研究表明，与以往认为纳米片的形成主要取决于碘离子的选择性结合不同，我们的结果表明，碘离子可能具有双重功能：它可以选择性地结合到Au{111}面上，也可以通过氧化腐蚀生成三碘离子(I-3(-))来选择性地去除其他不太稳定的形状杂质，从而促进以平面结构为主的原子核的形成。这条新的合成路线不仅有助于更好地理解三角形金纳米板的生长机理，而且将促进各向异性贵金属纳米结构的研究。
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 (I-3(-)), 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.