Abstract
Graphene is a strong contender as a material to replace indium tin oxide as the transparent conductor of choice for electronic applications due to its exceptional electrical and optical properties. In this work, we present a study of graphene oxide (GO) films produced by inkjet-printing. The printed GO films are reduced using hydriodic acid (HI) and acetic acid vapour at low temperature. The reduced GO (rGO) films displayed good optical and electrical properties with a sheet resistance 6.8 kΩ/□ at a transmittance of 80%. In addition, we show that the conductivity of rGO films is related to both the size of individual GO sheets in the ink and the thickness of printed films. The rGO films using large size GO sheets displayed a thickness-independent conductivity of ~ 4 × 104 S/m, while the rGO films using small size GO sheets showed a thickness-independent conductivity of ~ 1.7 × 104 S/m. These properties are comparable to graphene films produced by solvent exfoliation. In summary, we demonstrate a scalable and potentially low-cost technique to produce rGO transparent films and a route to improve the conductivity of rGO films by controlling size of GO sheets in the ink.
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Acknowledgments
The authors would like to thank Drs. Cristina Vallés and Prof. Ian A. Kinloch for their extensive help and advice during GO synthesis. This work was supported by the EPSRC through grant reference EP/L012022/1 and the China Scholarship Council.
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He, P., Derby, B. Inkjet Printing Graphene-Based Transparent Conductive Films. MRS Online Proceedings Library 1699, 36–41 (2014). https://doi.org/10.1557/opl.2014.612
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DOI: https://doi.org/10.1557/opl.2014.612