Journal
ACS NANO
Volume 7, Issue 2, Pages 1342-1350Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn304922s
Keywords
Co nanoparticles; nanocrystallinity; 2D ordering effect; core/shell structures; hollow structures; STEM; EELS
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Funding
- Advanced Grant of the European Research Council [267129]
- French MET
- China Scholarship Council
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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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