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Issue 42, 2009
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Surface-specific overgrowth of platinum on shaped gold nanocrystals

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Abstract

Controlling the shape and composition of metal nanocrystals can be beneficial for tuning the optical or catalytic properties in a variety of applications. In this study, surface-specific overgrowth of platinum was found on shaped gold nanocrystals of cubes, octahedra and spheres. Platinum overgrowth was observed on the planar faces of gold cubes, while the overgrowth occurred at the vertices of gold octahedra, indicating that platinum was selectively reduced on the Au (100) surface for each gold nanocrystal shape. The platinum nuclei covered the entire surface for gold spheres, which don’t have well-defined surfaces. As the Pt/Au ratio increased, a full platinum shell was formed. Solution-based UV-Vis absorption spectra of the composite nanocrystals showed that the absorption peak was red-shifted with increasing platinum coverage. The optical response of a single composite nanocrystal was measured by dark field microscope, which also demonstrated a red shift in the scattering spectrum with increasing platinum coverage. The extent of a red shift depended on the shape and composition of the composite nanocrystals.

Graphical abstract: Surface-specific overgrowth of platinum on shaped gold nanocrystals

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Publication details

The article was received on 01 Jul 2009, accepted on 06 Aug 2009 and first published on 24 Aug 2009


Article type: Paper
DOI: 10.1039/B912962F
Phys. Chem. Chem. Phys., 2009,11, 9759-9765

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    Surface-specific overgrowth of platinum on shaped gold nanocrystals

    M. Min, C. Kim, Y. In Yang, J. Yi and H. Lee, Phys. Chem. Chem. Phys., 2009, 11, 9759
    DOI: 10.1039/B912962F

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