期刊
ACS NANO
卷 6, 期 3, 页码 2617-2628出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn2051168
关键词
heteroepitaxial deposition; branched nanostructures; kinetic control; hopper crystals; concave nanocrystals; shape control
类别
资金
- Indiana University
Gold palladium 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-Pd 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.
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