Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 38, Pages 10190-10194Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201404144
Keywords
carbon; density functional calculations; graphene oxide; oxidation
Categories
Funding
- NSFC [11290164, 11105088]
- SNSFC [13ZR1447900]
- Shanghai University [HPC ZQ4000]
- Supercomputer Center of the Chinese Academy of Sciences
- Shanghai Supercomputer Center of China
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Recent experiments have shown the coexistence of both large unoxidized and oxidized regions on graphene oxide (GO), but the underlying mechanism for the formation of the GO atomic structure remains unknown. Now, using density functional calculations, 52 oxidation pathways for local pyrene structures on GO were identified, and a kinetic profile for graphene oxidation with a high correlation between oxidation loci was proposed, which is different from the conventional view, which entails a random distribution of oxidation loci. The high correlation is an essential nature of graphene oxidation processes and can be attributed to three crucial effects: 1) breaking of delocalized pi bonds, 2) steric hindrance, and 3) hydrogen-bond formation. This high correlation leads to the coexistence of both large unoxidized and oxidized regions on GO. Interestingly, even in oxidized regions on GO, some small areas of sp(2)-hybridized domains, similar to islands, can persist because of steric effects.
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