Seed-Mediated Co-reduction: A Versatile Route to Architecturally Controlled Bimetallic Nanostructures
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- 作者：Christopher J. DeSantis ; Aaron C. Sue ; Matthew M. Bower ; Sara E. Skrabalak
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：March 27, 2012
- 年：2012
- 卷：6
- 期：3
- 页码：2617-2628
- 全文大小：692K
- 年卷期：v.6,no.3(March 27, 2012)
- ISSN：1936-086X
文摘
Gold鈥損alladium octopods and new concave and shape-controlled alloy nanostructures are synthesized by seed-mediated co-reduction, wherein two metal precursors are reduced in the presence of seeds that serve as preferential sites for the growth of the larger nanostructures. Here, the first comprehensive study of this technique is presented in a model Au鈥揚d system and provides insight into the mechanism of formation for these architecturally distinct nanocrystals. A systematic evaluation of synthesis conditions decoupled the roles of (i) Au:Pd precursor ratio, (ii) reaction pH, and (iii) capping agent concentration in morphology development. These factors provide control of growth kinetics and ultimately the morphology and composition of the final nanostructures. Significantly, elucidating the overgrowth processes during seed-mediated co-reduction will lead to the synthesis of other architecturally controlled bimetallic nanocrystals.