期刊
ACS NANO
卷 7, 期 2, 页码 1342-1350出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn304922s
关键词
Co nanoparticles; nanocrystallinity; 2D ordering effect; core/shell structures; hollow structures; STEM; EELS
类别
资金
- Advanced Grant of the European Research Council [267129]
- French MET
- China Scholarship Council
Here it is demonstrated that the diffusion process of oxygen in Co nanoparticles is controlled by their 2D ordering and crystallinity. The crystallinity of isolated Co nanoparticles deposited on a substrate does not play any role in the oxide formation. When they are self-assembled in 2D superlattices, the oxidation process is slowed and produces either core/shell (Co/CoO) nanoparticles or hollow CoO nanocrystals. This is attributed to the decrease in the oxygen diffusion rate when the nanoparticles are interdigitated. Initially, polycrystalline nanoparticles form core/shell (Co/CoO) structures, while for single-domain hexagonal close-packed Co nanocrystals, the outward diffusion of Co Ions is favored over the inward diffusion of oxygen, producing hollow Co0 single-domain nanocrystals.
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