Seed-Mediated Co-reduction: A Versatile Route to Architecturally Controlled Bimetallic Nanostructures

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 comprehensi...

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Bibliographic Details
Published in:ACS nano 2012-03, Vol.6 (3), p.2617-2628
Main Authors: DeSantis, Christopher J, Sue, Aaron C, Bower, Matthew M, Skrabalak, Sara E
Format: Article
Language:English
Subjects:
Alloys - chemistry
Bimetals
Capping
Cetrimonium Compounds - chemistry
Concentration (composition)
Gold - chemistry
Hydrogen-Ion Concentration
Kinetics
Metal Nanoparticles - chemistry
Morphology
Nanocrystals
Nanostructure
Nanotechnology - methods
Palladium - chemistry
Precursors
Seeds
Synthesis
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Summary: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.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn2051168