UV-LIGHT-ASSISTED OXIDATIVE sp(3) HYBRIDIZATION OF GRAPHENE

作者：Guenes 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; Lee Young Hee

来源：Nano, 2011, 6(5): 409-418.

DOI：10.1142/S1793292011002780

• Graphene oxide
• UV-light
• transition from metallic to insulator
• transparent conducting films

We report the transformation of electronic structures of sp(2) graphene to sp(3) 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.

• 出版日期2011-10