纳米棒
涂层
纳米晶
材料科学
双金属片
各向异性
同种类的
纳米结构
表面能
沉积(地质)
纳米技术
化学工程
金属
化学物理
复合材料
化学
光学
冶金
古生物学
物理
工程类
沉积物
生物
热力学
作者
Yanjuan Xiang,Xiaochun Wu,Dongfang Liu,Zhiyuan Li,Weiguo Chu,Lili Feng,Ke Zhang,Weiya Zhou,Sishen Xie
出处
期刊:Langmuir
[American Chemical Society]
日期:2008-02-23
卷期号:24 (7): 3465-3470
被引量:194
摘要
Single crystalline gold nanorods (Au NRs) dominated by {110} side facets were employed as seeds to tailor the deposition of Ag. Apart from homogeneous coating, anisotropic coating of Ag was observed and resulted in an orange slice-like shape for the Au@Ag nanocrystal. Different growth rates for the {110} side facets were responsible for this shape: among the four {110} facets, two of the neighboring {110} facets grew more quickly and another two grew more slowly, thus inducing the anisotropic deposition of Ag around the Au NR. This growth behavior is believed to 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 the anisotropic coating remains to be clarified, our results lead to one important conclusion: The interaction of CTAB and metal can be utilized to tune the shapes of bimetallic structures.
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