Tuning the Morphology of Gold Nanocrystals by Switching the Growth of {110} Facets from Restriction to Preference

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• 作者：Yanjuan Xiang ; Xiaochun Wu ; Dongfang Liu ; Lili Feng ; Ke Zhang ; Weiguo Chu ; Weiya Zhou ; Sishen Xie
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：March 6, 2008
• 年：2008
• 卷：112
• 期：9
• 页码：3203 - 3208
• 全文大小：601K
• 年卷期：v.112,no.9(March 6, 2008)
• ISSN：1932-7455

文摘

Single crystalline Au nanorods (Au NRs), synthesized via seed-mediated growth, show unique surface structures.Apart from the oft-observed {100} and {111} facets, unexpectedly, unstable {110} facets dominate in suchnanorods due to {110} restricted growth. Unique properties have been suggested for the nanorods. One novelproperty, we believe, is that the the high-energy {110} endows the nanorod with a high reactivity, thus makingthe growth to more stable morphologies possible. Herein, by switching the growth to the {110} preference,we successfully obtained thermodynamically more stable morphologies (arrow-headed gold nanorods andgold nano-octahedra) with a high quality and yield. A blockade of selective underpotential deposition ofsilver is suggested to be responsible for the switching.