De, G and Rao, CNR (2005) Au-Pt alloy nanocrystals incorporated in silica films. Journal of Materials Chamistry, 15 (8). pp. 891-894. ISSN 0959-9428

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Au, Pt and Au-Pt alloy nanocrystals have been prepared in thin SiO(2) film matrices by sol-gel spin-coating, followed by heating at 450degreesC in 10% H(2)-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
Subjects: Microstructure and Characterization
Engineering Materials
Depositing User: Bula Ghosh
Date Deposited: 17 Feb 2012 11:54
Last Modified: 17 Feb 2012 11:54

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