Issue 36, 2015

Regiospecific growth of Au on a concave PtZn nanocube forming an Au–PtZn surface mosaic nanocube and an Au–PtZn octapod

Abstract

Regioselective growth of a heterophase on facet-controlled nanocrystals is an indispensable step towards generation of geometrically well-defined heteronanoarchitectures. The growth of a heterophase usually occurs on the most unstable surface features of a nanoparticle, such as vertices and edges, and therefore the ability to control the surface energy of facet-controlled nanocrystals is crucial for the rational synthesis of nanoarchitectures. It is, however, not easy to attain the ability to regioselectively grow a heterophase on a facet-controlled nanocrystal. Herein we introduce a simple strategy to pinpoint the site of heterophase growth on the surface of a faceted nanocrystal by controlling the concentration of surface-stabilizing moieties. Specifically, we show the regioselective growth of Au on a PtZn concave nanocube, covered with surface-bound CO moieties, forming two completely different Au–PtZn heteronanostructures of a filled-concave Au–PtZn surface mosaic nanocube and a vertex-covered Au–PtZn octapod. We also show their application in surface-enhanced Raman scattering (SERS)-based detection of small molecules.

Graphical abstract: Regiospecific growth of Au on a concave PtZn nanocube forming an Au–PtZn surface mosaic nanocube and an Au–PtZn octapod

Supplementary files

Article information

Article type
Communication
Submitted
03 mar 2015
Accepted
10 apr 2015
First published
16 apr 2015

CrystEngComm, 2015,17, 6838-6842

Regiospecific growth of Au on a concave PtZn nanocube forming an Au–PtZn surface mosaic nanocube and an Au–PtZn octapod

K. W. Lee, H. An, S. Haam, H. Baik and K. Lee, CrystEngComm, 2015, 17, 6838 DOI: 10.1039/C5CE00429B

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