Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 15, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-013-1660-z
Keywords
Core-shell nanostructure; Growth mechanism; High index facet surfaces; Cs-corrected scanning transmission electron microscopy
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Funding
- National Center for Research Resources from the National Institutes of Health [5 G12RR013646-12]
- National Institute on Minority Health and Health Disparities from the National Institutes of Health [G12MD007591]
- NSF [DMR-1103730, DMR 0934218]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1103730] Funding Source: National Science Foundation
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Au-Pd core-shell nanocubes and triangular nanoparticles were systematically synthesized from a few Pd layers up to fully grown morphologies by a modified seed-mediated growth method. The shape evolution of Au-Pd core-shell nanoparticles from single crystal and singly twinned seed to final concave nanocube and triangular plates are presented at atomic level by Cs-corrected scanning transmission electron microscopy (STEM). The growth mechanism of both morphologies was studied throughout different sizes. It was found that the concave nanocubes grew from octahedral Au seeds due to fast growth along < 111 > directions; while the triangular nanoparticles grew from singly twinned Au seeds, growing twice as fast in < 110 > directions along the twin boundary; compared to the < 111 > direction perpendicular to the twin boundary. Both the concave nanocubes and triangular nanoparticles presented high index facet (HIF) surfaces that will increase the catalytic activity of different reactions.
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