Nano Archive

Au–Pt alloy nanocrystals incorporated in silica films

De, Gautham and Rao, C. N. R. (2004) Au–Pt alloy nanocrystals incorporated in silica films. Journal of Materials Chemistry, 15 . pp. 891-894.

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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.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3617
Deposited By:JNCASR
Deposited On:19 Jan 2009 09:47
Last Modified:19 Jan 2009 09:47

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