期刊
NANOSCALE
卷 5, 期 11, 页码 5067-5072出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr00829k
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资金
- National Natural Science Foundation of China [50971011, 11174023]
- Beijing Natural Science Foundation [1102025]
- Beijing Municipal research project for outstanding doctoral thesis supervisors [20121000603]
- Start Science Foundation of Sichuan University [2012SCU11084]
- NSF [DMR-0907191, DMR-0723032]
The structure evolution behaviors of NiAu nanospindles in oxidizing/vacuum conditions were studied by in situ scanning transmission electron microscopy. The spindle structure transforms into Ni@Au@NiO multi-shell structure in the oxidizing atmosphere following an oxidation-driving multilayer reconstruction mechanism. In the vacuum condition, the NiAu nanospindles evolve along four distinct stages: (i) polyhedron recrystallization of Ni matrix; (ii) facets-selected segregation and recrystallization of Au component; (iii) single crystallization of Ni matrix; (iv) wrapping diffusion of Au component. The investigation here provides a practical insight into the structural stability of NiAu bimetallic catalysts through a thermal processes.
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