Water-Phase Synthesis of Ultrathin Au Nanowires with a Two-Dimensional Parallel Array Structure
Water-Phase Synthesis of Ultrathin Au Nanowires with a Two-Dimensional Parallel Array Structure
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DOI：
10.1246/bcsj.20200183
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发表时间：
2020-11-01
影响因子：
4
通讯作者：
Kawai, Takeshi
中科院分区：
文献类型：
--
作者：
Miyajima, Naoya;Wang, Yung-Chen;Kawai, Takeshi
直径小于2nm的超薄金纳米线作为一种极具发展前景的一维纳米材料受到了广泛的关注。然而，它们实际上是在有机溶剂中合成的。本文首次报道了以水溶性长链氨基胺衍生物（C18AA）为关键化合物，在水中合成了直径约1.7 nm的超薄金纳米粒子。所制得的Au - NWs在水中具有自然分散性，是一种环境友好型溶剂。我们还证明了Au NWs的形成是基于取向附着生长机制的，并且Cl-离子的存在有助于其有效伸长数μ m。此外，水分散体的低温透射电子显微镜（cryo-TEM）显示，Au NWs在水中自组装成二维平行阵列的束状结构。
Ultrathin Au nanowires (NWs) with a diameter below 2 nm have attracted considerable attention as a promising one-dimensional nanomaterial. However, they are practically synthesized in organic solvents. Here, for the first time, we report the synthesis of ultrathin Au NWs with similar to 1.7 nm diameter in water using a water-soluble long-chain amidoamine derivative (C18AA) as a key compound. The resultant Au NWs were naturally dispersible in water, which is an environment-friendly solvent. We also demonstrate that the formation of the Au NWs is based on oriented-attachment growth mechanism, and that the presence of Cl- ion facilitates its effective elongation over a length of a few mu m. Further, cryogenic transmission electron microscopy (cryo-TEM) of the aqueous dispersion revealed that the Au NWs self-assembled into a bundle structure with two-dimensional parallel arrays in water.