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Au-Pt alloy nanocrystals incorporated in silica films

De, Goutam and Rao, CNR (2005) Au-Pt alloy nanocrystals incorporated in silica films. In: Journal of Materials Chemistry, 15 . pp. 891-894.


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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 uC 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: Journal Article
Publication: Journal of Materials Chemistry
Publisher: The Royal Society of Chemistry
Additional Information: Copyright for this article belongs to the Royal Society of Chemistry.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 04 Apr 2005
Last Modified: 19 Sep 2010 04:18
URI: http://eprints.iisc.ac.in/id/eprint/3032

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