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Issue 19, 2014
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Shape-defined nanodimers by tailored heterometallic epitaxy

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Abstract

The systematic construction of heterogeneous nanoparticles composed of two distinct metal domains (Au and Pt) and exhibiting a broad range of morphologically defined shapes is reported. It is demonstrated that careful Au overgrowth on Pt nanocrystal seeds with shapes mainly corresponding to cubeoctahedra, octahedra and octapods can lead to heterometallic systems whose intrinsic structures result from specific epitaxial relationships such as {111} + {111}, {200} + {200} and {220} + {220}. Comprehensive analysis shows also that nanoparticles grown from octahedral seeds can be seen as comprising of four Au tetrahedral subunits and one Pt octahedral unit in a cyclic arrangement that is similar to the corresponding one in decahedral gold nanoparticles. However, in the present case, the multi-component system is characterized by a broken five-fold rotational symmetry about the [011] axis. This set of bimetallic dimers could provide new platforms for fuel cell catalysts and plasmonic devices.

Graphical abstract: Shape-defined nanodimers by tailored heterometallic epitaxy

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Supplementary files

Article information


Submitted
03 Apr 2014
Accepted
11 Jun 2014
First published
13 Jun 2014

This article is Open Access

Nanoscale, 2014,6, 11090-11097
Article type
Paper
Author version available

Shape-defined nanodimers by tailored heterometallic epitaxy

C. A. García-Negrete, T. C. Rojas, B. R. Knappett, D. A. Jefferson, A. E. H. Wheatley and A. Fernández, Nanoscale, 2014, 6, 11090
DOI: 10.1039/C4NR01815J

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