Pal, Sudipto and De, Goutam (2005) A new approach for the synthesis of Au-Ag alloy nanoparticle incorporated SiO(2) films. Chemistry of Materials., 17 (24). pp. 6161-6166. ISSN 0897-4756

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Abstract

A new synthesis procedure has been developed to prepare Au-Ag alloy nanoparticles inside glassy SiO(2) film matrix. Two successive overlapping coating layers were prepared on glass substrate using Au-and Ag-incorporated inorganic-organic hybrid silica sols, respectively. The concentrations of the An and Ag (3 equivalent mol % metal - 97% silica in each case) in the respective layers and their individual coating thicknesses were kept similar for the generation of 1:1 Au-Ag (AU(0.5)Ag(0.5)) alloy. The dried two-layer (TL) coating assembly after UV (2.75 J/cm(2)) and followed by thermal treatments (450-550 degrees C) yielded Au-Ag alloy nanoparticles of controllable molar ratios in a glassy SiO(2) matrix. Thus, the UV-treated TL film when heated at 450 degrees C yielded spherical Au-Ag alloy nanoparticles (An mol fraction;approximate to 0.8) of average diameter ((D)) 2.5 nm whereas the 550 degrees C heated film sample showed relatively larger alloy nanoparticles of < D > 4.5 nm having An mol fraction of approximate to 0.5. The alloy nanoparticles were formed through the interlayer diffusion of Ag and Au during the thermal annealing in the solid state.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	20 Mar 2012 06:53
Last Modified:	20 Mar 2012 06:53
URI:	http://cgcri.csircentral.net/id/eprint/1268

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