Temperature-dependent structuring of Au-Pt bimetallic nanoclusters on a thin film of Al2O3/NiAl(100)

Meng Fan Luo, Chao Chuan Wang, Chen Sheng Chao, Chiun Yu Ho, Cheng Ting Wang, Won Ru Lin, Yin Chang Lin, Yu Lin Lai, Yao Jane Hsu

研究成果: 雜誌貢獻期刊論文同行評審

11 引文 斯高帕斯(Scopus)

摘要

Au-Pt bimetallic nanoclusters on a thin film of Al2O 3/NiAl(100) undergo significant structural evolution on variation of the temperature. Au and Pt deposited sequentially from the vapor onto thin-film Al2O3/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 -Al2O 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.

原文???core.languages.en_GB???
頁(從 - 到)1531-1541
頁數11
期刊Physical Chemistry Chemical Physics
13
發行號4
DOIs
出版狀態已出版 - 28 1月 2011

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