Pal, Sudipto and De, Goutam (2008) Formation of Au-Pt bimetallic nanoparticles in a two-layer SiO(2) films doped with Au and Pt, respectively, through interlayer diffusion. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 10 (27). pp. 4062-4066.

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Bimetallic Au-Pt nanoparticles have been generated inside a relatively porous SiO(2) film matrix by a two-layer (2L) coating methodology. Two overlapping coating layers were deposited on glass substrates from Au- and Pt-doped inorganic-organic hybrid silica sols and air dried at 60 degrees C. The 2L coating assembly was then UV- and followed by heat-treated at 450 and 550 degrees C in air. UV-treatment decomposes AuCl(4)(-) and PtCl(6)(2-) ions in the respective layers and the subsequent heat treatment in air influences the diffusion of Au- and Pt nanometals to each other to form bimetallic Au-Pt nanoparticles inside the silica matrix. A UV-visible study showed damping of Au-plasmon after heat treatments. GIXRD and TEM analyses reveal the formation of a partial Au/Pt solid solution with a small fraction of Pt (similar to 16%), while the major fraction of Pt remains fused with the Au(Pt) solid solution.

Item Type: Article
Subjects: Processing Science
Depositing User: Bula Ghosh
Date Deposited: 19 Jan 2012 12:34
Last Modified: 19 Jan 2012 12:34

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