Temperature-dependent structuring of Au–Pt bimetallic nanoclusters on a thin film of Al2O3/NiAl(100)
Literature Information
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
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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![(3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure (3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure](https://static.chemtradehub.com/structs/538/53800-21-8-9f18.webp)

![(1R,6R)-6-({[(2-Methyl-2-propanyl)oxy]carbonyl}amino)-3-cyclohexene-1-carboxylic acid structure (1R,6R)-6-({[(2-Methyl-2-propanyl)oxy]carbonyl}amino)-3-cyclohexene-1-carboxylic acid structure](https://static.chemtradehub.com/structs/865/865689-24-3-5fef.webp)
