Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/395
Title: Au–Pt alloy nanocrystals incorporated in silica films
Authors: De, Goutam
Rao, C N R
Keywords: Optical-Properties
Nanoparticles
Silver
Gold
Sol
Particles
Copper
Clusters
Spectra
Sio2
Issue Date: 2005
Publisher: Royal Society Chemistry
Citation: Journal of Materials Chemistry 15(8), 891-894 (2005)
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 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.
URI: http://hdl.handle.net/10572/395
Other Identifiers: 0959-9428
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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