Journal
CHEMISTRY OF MATERIALS
Volume 21, Issue 23, Pages 5674-5680Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm902182y
Keywords
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Funding
- Nanyang Technological University, Singapore
- National Research Foundation Singapore [NRF- CRP2-2007-02]
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Ultra large and single-layer graphene oxide sheets (up to millimeter in lateral size) are obtained by a modified Hummers' method, where we replace the first aggressive oxidation process with a short sonication step in H2SO4 solutions. The lateral size of obtained GO sheets can be adjusted by the sonication period: it decreases with the increasing sonication time. The thin-film electrodes made from ultra large reduced GO sheets exhibit lower sheet resistance compared with those from small-size reduced GO sheets. Moreover, the transistor devices made from these single-layer GO sheets after 800 degrees C thermal reduction exhibit the effective hole mobility ranged between 4 and 12 cm(2)/(V s). Raman spectroscopic results suggest that the enhancement in mobility at a higher-mobility regime is well explained by the graphitization of GO rather than the removal of functional groups. The ratio between the 2D and G peak areas, I(2D)/I(G), is well correlated to the effective hole mobility values in reduced GO sheets.
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