Gold Nanorod-Seeded Growth of Silver Nanostructures: From Homogeneous Coating to Anisotropic Coating

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• 作者：Yanjuan Xiang ; Xiaochun Wu ; Dongfang Liu ; Zhiyuan Li ; Weiguo Chu ; Lili Feng ; Ke Zhang ; Weiya Zhou ; Sishen Xie
• 刊名：Langmuir
• 出版年：2008
• 出版时间：April 1, 2008
• 年：2008
• 卷：24
• 期：7
• 页码：3465 - 3470
• 全文大小：551K
• 年卷期：v.24,no.7(April 1, 2008)
• ISSN：1520-5827

文摘

Single crystalline gold nanorods (Au NRs) dominated by {110} side facets were employed as seeds to tailor thedeposition of Ag. Apart from homogeneous coating, anisotropic coating of Ag was observed and resulted in an orangeslice-like shape for the Au@Ag nanocrystal. Different growth rates for the {110} side facets were responsible forthis shape: among the four {110} facets, two of the neighboring {110} facets grew more quickly and another twogrew more slowly, thus inducing the anisotropic deposition of Ag around the Au NR. This growth behavior is believedto be a consequence of competition between the strong stabilization of cetyltrimethylammomium bromide (CTAB)molecules to the {110} facets of Ag and minimization of the overall surface energy. Although the reason for theanisotropic coating remains to be clarified, our results lead to one important conclusion: The interaction of CTABand metal can be utilized to tune the shapes of bimetallic structures.