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

文献信息

发布日期 2010-11-29
DOI 10.1039/C0CP00954G
影响因子 3.676
作者

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


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摘要

Au–Pt bimetallic nanoclusters on a thin film of Al2O3/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 θ-Al2O3(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.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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