Au–Pt alloy nanocrystals incorporated in silica films

De, Goutam ; Rao, C. N. R. (2005) Au–Pt alloy nanocrystals incorporated in silica films Journal of Materials Chemistry, 15 (8). pp. 891-894. ISSN 0959-9428

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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.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:43712
Deposited On:15 Jun 2011 05:47
Last Modified:18 May 2016 00:36

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