Journal
ACS NANO
Volume 3, Issue 1, Pages 139-148Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn800531q
Keywords
monodisperse; multiply twinned particles; nanoparticles; noble metal; self-assembly
Categories
Funding
- Ministry of Education Academic Research [R279-000-260-112]
- National University of Singapore
- Singapore-MIT alliance
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This paper reports the synthesis and self-assembly of monodisperse icosahedral Ag, Au, and Pd nanoparticles with tunable sizes. Ag nanoparticles were first prepared by a modified polyol method. The assynthesized Ag nanoparticles were all icosahedral multiply twinned particles (MTPs) with notable size variations. The variability was reduced to less than 5% after a digestive ripening post treatment. The nearly monodisperse Ag nanoparticles were then used in replacement reactions with All and I'd precursors to produce monodisperse icosahedral Au and Pd nanoparticles. The size of the monodisperse icosahedral Ag, Au, and Pd nanoparticles could also be increased thereafter by seed-mediated growth. The closely matched geometrical attributes of these icosahedral nanoparticles allowed them to easily self-assemble into 3-D superlattices either in the solution phase or on a solid substrate.
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