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 cm2/V·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.
Original language | English (US) |
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Pages (from-to) | 5285-5292 |
Number of pages | 8 |
Journal | ACS Nano |
Volume | 4 |
Issue number | 9 |
DOIs | |
State | Published - Sep 28 2010 |
Externally published | Yes |
Keywords
- Raman spectroscopy
- graphene oxide
- transistors
- transparent conducting electrodes
ASJC Scopus subject areas
- General Materials Science
- General Engineering
- General Physics and Astronomy