1. UV-LIGHT-ASSISTED OXIDATIVE sp3 HYBRIDIZATION OF GRAPHENE.
- Author
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GÜNEŞ, FETHULLAH, HAN, GANG HEE, SHIN, HYEON-JIN, LEE, SI YOUNG, JIN, MEIHUA, DUONG, DINH LOC, CHAE, SEUNG JIN, KIM, EUN SUNG, YAO, FEI, BENAYAD, ANASS, CHOI, JAE-YOUNG, and LEE, YOUNG HEE
- Subjects
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ULTRAVIOLET radiation , *GRAPHENE , *ELECTRONIC structure , *OXIDATION , *METAL-insulator transitions , *OXYGEN , *ELECTRONS , *HYDROXYL group - Abstract
We report the transformation of electronic structures of sp2 graphene to sp3 graphene by UV-light-assisted oxidation. Two distinctive oxidation mechanisms were observed during this metal-insulator transition: (i) At low-oxidation regime, p-doping behavior by oxygen species extracting electrons from graphene and (ii) at high-oxidation regime, n-doping behavior by electron-hopping via strongly localized oxide states. We also found that the dominant oxygen-related functional group by UV-light-assisted oxidation was an epoxide group rather than hydroxyl group, which differed from conventional graphite oxide. [ABSTRACT FROM AUTHOR]
- Published
- 2011