Journal
NANO RESEARCH
Volume 10, Issue 7, Pages 2344-2350Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1429-2
Keywords
oxidation; in situ electron microscopy; Cu2O; intermediated phases
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Funding
- National Basic Research Program of China [2011CB933300]
- National Natural Science Foundation of China [51671148, 51271134, J1210061, 11674251, 51501132, 51601132]
- Hubei Provincial Natural Science Foundation of China [2016CFB446, 2016CFB155]
- Fundamental Research Funds for the Central Universities
- CERS-China Equipment and Education Resources System [CERS-1-26]
- China Postdoctoral Science Foundation [2014T70734]
- Open Research Fund of Science and Technology on High Strength Structural Materials Laboratory (Central South University)
- Suzhou Science and Technology project [SYG201619]
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Atomic-scale oxidation dynamics of Cu2O nanocrystallines (NCs) are directly observed by in situ high-resolution transmission electron microscopy. A two-stage oxidation process is observed: (1) The initial oxidation stage is dominated by the dislocation-mediated oxidation behavior of Cu2O NCs via solid-solid transformations, leading to the formation of a new intermediate CuOx phase. The possible crystal structure of the CuOx phase is discussed. (2) Subsequently, CuOx is transformed into CuO by layer-by-layer oxidation. These results will help in understanding the oxidation mechanisms of copper oxides and pave the way for improving their structural diversity and exploiting their potential industrial applications.
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