Controlled Growth of Ag/Au Bimetallic Nanorods through Kinetics Control
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- 作者：Yun Yang ; Wenfang Wang ; Xingliang Li ; Wei Chen ; Nini Fan ; Chao Zou ; Xian Chen ; Xiangju Xu ; Lijie Zhang ; Shaoming Huang
- 刊名：Chemistry of Materials
- 出版年：2013
- 出版时间：January 8, 2013
- 年：2013
- 卷：25
- 期：1
- 页码：34-41
- 全文大小：500K
- 年卷期：v.25,no.1(January 8, 2013)
- ISSN：1520-5002
文摘
One-dimension noble nanomaterials have promising applications in many fields, and their growth pattern control is significant to property modulation. Herein, we report a facile strategy with which the growth pattern of Ag on the Au nanorod (NR) or decahedral nanoparticle (NP) surface can be precisely controlled and various structured Ag/Au NRs can be synthesized. Achievement of growth pattern control is mainly attributed to the adjustable reaction kinetics of Ag鈥?/sup> to Ag0. Slow and moderate reaction rate favor asymmetrical growth, producing Au-tipped Ag NRs and asymmetrical Ag鈥揂u鈥揂g NRs, respectively. In the case of a fast reaction rate, symmetrical growth dominates and symmetrical Ag鈥揂u鈥揂g NRs form. Furthermore, the prepared bimetallic NRs can be used as starting materials to generate other novel nanostructures (nanocups, nanonails, and longer Au-tipped Ag NRs). The result presented here is vital to both exploration of growth theory and constructing nanostructures of not only the Au/Ag bimetallic system but also possibly other noble bimetallic systems. Moreover, these prepared nanostructures could provide model materials for studying the physical properties (such as structure-dependent surface plasmon) or have potential applications in the medical field. For example, hollow nanocups can serve as containers for controlled release of drug, etc.