Preparation of Silica-Coated Ultrathin Gold Nanowires with High Morphological Stability
Preparation of Silica-Coated Ultrathin Gold Nanowires with High Morphological Stability
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DOI：
10.1021/la403681w
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发表时间：
2014-02-25
期刊：
影响因子：
3.9
通讯作者：
Kawai, Takeshi
中科院分区：
文献类型：
--
作者：
Imura, Yoshiro;Hojo, Satoshi;Kawai, Takeshi
介绍了一种二氧化硅包覆的直线型超薄Au纳米线的制备方法。用长链氨基胺衍生物(C18AA)包覆的水分散型超薄Au纳米粒子用于二氧化硅涂层。采用配体交换法在Au-NWS表面部分包覆了3-巯基丙酸，在酸性条件下Au-NW的形状发生了变化，在pH=6.7的条件下，通过正硅酸乙酯(TEOS)的水解反应对Au-NWS进行了硅胶包覆。二氧化硅的厚度依赖于正硅酸乙酯的浓度，可以减小到6-10 nm厚。我们还证明了与裸露的Au NWS相比，包覆了SiO_2的Au NWS对诸如电子显微镜、电子束、热和pH等外界刺激具有更高的形态稳定性。
We demonstrated a preparation method of silica-coated straight ultrathin Au nanowires (NWs). Water-dispersive ultrathin Au NWs capped with a long-chain amidoamine derivative (C18AA) were used for silica coating. The Au NWs were partially covered with 3-mercaptopropanoic acid by the ligand exchange method, and silica coating of the Au NWs was carried out by the hydrolysis of tetraethoxysilane (TEOS) at pH > 6.7 because the shape of the Au NWs was changed under acidic conditions. The thickness of the silica layer depended on the concentration of TEOS, and the layer was able to decrease to 6-10 nm thick. We also demonstrated that the silica-coated Au NWs had high morphological stabilities against external stimuli such as a TEM electron beam, heat, and pH compared with the bare Au NWs.