title: Highly efficient restoration of graphitic structure in graphene oxide using alcohol vapors.
abstract: Solution-based processes involving the chemical oxidation of graphite and reduction of the obtained graphene oxide (GO) sheets have attracted much attention for preparing graphene films for printed electronics and biosensors. However, the low electrical conductivity of reduced GO is still hindering the development of electronic applications. This article presents that GO sheets reduced by high-temperature alcohol vapors exhibit highly graphitic structures and excellent electrical conductivity. The sheet resistance of thin transparent films is lowered to ∼15 kΩ/◻ (>96% transparency). Field-effect transistors produced from these reduced GO sheets exhibit high effective field-effect hole mobility up to 210 cm(2)/V x s. Raman spectroscopic studies reveal that the conductivity enhancement in the low mobility regime is attributed to the removal of chemical functional groups and the formation of six-fold rings. In the high mobility regime, the growth of the graphitic domain size becomes dominant for enhancing its electrical conductivity. The excellent electrical conductivity of the reduced GO sheets promises potential electronic applications.
authors: Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan.
authors: Ching-Yuan
authors: CY
authors: Su
authors: Yanping
authors: Y
authors: Xu
authors: Wenjing
authors: W
authors: Zhang
authors: Jianwen
authors: J
authors: Zhao
authors: Aiping
authors: A
authors: Liu
authors: Xiaohong
authors: X
authors: Tang
authors: Chuen-Horng
authors: CH
authors: Tsai
authors: Yizhong
authors: Y
authors: Huang
authors: Lain-Jong
authors: LJ
authors: Li
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D004553:Electric Conductivity; D006108:Graphite / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D013696:Temperature; D014835:Volatilization
chemical_list: D000438:Alcohols; D010087:Oxides; D006108:Graphite