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Issue 8, 2005
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Au–Pt alloy nanocrystals incorporated in silica films

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Abstract

Au, Pt and Au–Pt alloy nanocrystals have been prepared in thin SiO2 film matrices by sol–gel spin-coating, followed by heating at 450 °C in 10% H2–90% Ar. X-Ray diffraction patterns reveal that the Au and Au–Pt nanocrystals have a preferential (111) orientation. Upon increasing the Pt concentration, part of the Pt does not alloy with Au, but instead forms a shell around the Au–Pt alloy core. The alloy composition itself goes up to Au(50) : Pt(50), and the Pt shells are formed around the alloy above an alloy composition of Au(75) : Pt(25). The surface plasmon resonance (SPR) band at 544 nm of Au gradually disappears due to the formation of Au–Pt alloys and core–shell structures.

Graphical abstract: Au–Pt alloy nanocrystals incorporated in silica films

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Publication details

The article was received on 11 Aug 2004, accepted on 23 Nov 2004 and first published on 15 Dec 2004


Article type: Paper
DOI: 10.1039/B412429D
J. Mater. Chem., 2005,15, 891-894

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    Au–Pt alloy nanocrystals incorporated in silica films

    G. De and C. N. R. Rao, J. Mater. Chem., 2005, 15, 891
    DOI: 10.1039/B412429D

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