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Metal nanocrystals with concave surfaces are interesting for a wide
variety of applications that are related to catalysis, plasmonics, and
surface-enhanced spectroscopy. This interest arises from their highindex
facets, surface cavities, and sharp corners/edges. Two major
challenges are associated with this novel class of nanocrystals: 1) how
to generate a concave surface with negative curvature, which is not
favored by thermodynamics owing to its higher energy than the convex
counterpart; and 2) how to stabilize the morphology of a nanocrystal
with concave structures on the surface. Recently, a number of different
procedures have been developed for the synthesis of noble-metal
nanocrystals with concave surfaces. This Review provides a brief
account of these developments, with the aim of offering new insights
into the growth mechanisms. We focus on methods based on two
general strategies: 1) site-specific dissolution through etching and
galvanic replacement; and 2) directionally controlled overgrowth by
facet-selective capping, kinetic control, and template-directed epitaxy.
Their enhanced catalytic and electrocatalytic properties are also described.

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  • 2012-05-28 08:53:00, 5.15 M

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