Temperature-dependent structuring of Au-Pt bimetallic nanoclusters on a thin film of Al(2)O(3)/NiAl(100)

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52986

Title:	Temperature-dependent structuring of Au-Pt bimetallic nanoclusters on a thin film of Al(2)O(3)/NiAl(100)
Authors:	Luo,MF;Wang,CC;Chao,CS;Ho,CY;Wang,CT;Lin,WR;Lin,YC;Lai,YL;Hsu,YJ
Contributors:	物理學系
Keywords:	SCANNING-TUNNELING-MICROSCOPY;METHANOL OXIDATION REACTION;PHOTOELECTRON-SPECTROSCOPY;GOLD CATALYSTS;SUPPORTED GOLD;OXIDE-FILMS;NANOPARTICLES;GROWTH;CLUSTERS;AL2O3
Date:	2011
Issue Date:	2012-06-11 10:53:03 (UTC+8)
Publisher:	國立中央大學
Abstract:	Au-Pt bimetallic nanoclusters on a thin film of Al(2)O(3)/NiAl(100) undergo significant structural evolution on variation of the temperature. Au and Pt deposited sequentially from the vapor onto thin-film Al(2)O(3)/NiAl(100) at 300 K form preferentially bimetallic nanoclusters (diameter <= 6.0 nm and height <= 0.8 nm) with both Au and Pt coexisting at the cluster surface, despite the order of metal deposition. These bimetallic clusters are structurally ordered, have a fcc phase and grow with their facets either (111) or (001) parallel to the theta-Al(2)O(3)(100) surface. Upon annealing the clusters to 400-500 K, the Au atoms inside the clusters migrate toward the surface, resulting in formation of a structure with a Pt core and an Au shell. Annealing the sample to 500-650 K reorients the bimetallic clusters-all clusters have their (001) facets parallel to the oxide surface-and induces oxidation of Pt. Such annealed bimetallic clusters become encapsulated with the aluminium-oxide materials and a few Au remain on the surface.
Relation:	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Appears in Collections:	[Department of Physics] journal & Dissertation

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