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  • Title: Gold nanorod-seeded growth of silver nanostructures: from homogeneous coating to anisotropic coating.
    Author: Xiang Y, Wu X, Liu D, Li Z, Chu W, Feng L, Zhang K, Zhou W, Xie S.
    Journal: Langmuir; 2008 Apr 01; 24(7):3465-70. PubMed ID: 18294010.
    Abstract:
    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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