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Physicochemical characterisation of reduced graphene oxide for conductive thin films

Legge, Elizabeth J., Ahmad, Muhammad, Smith, Christopher T. G., Brennan, Barry, Mills, Christopher A., Stolojan, Vlad, Pollard, Andrew J. and Silva, S. Ravi P. (2018) Physicochemical characterisation of reduced graphene oxide for conductive thin films RSC Advances, 8 (65). pp. 37540-37549.

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Graphene is a desirable material for next generation technology. However, producing high yields of single-layer flakes with industrially applicable methods is currently limited. We introduce a combined process for the reduction of graphene oxide (GO) via vitamin C (ascorbic acid) and thermal annealing at temperatures of <150 °C for times of <10 minutes, resulting in electrically conducting thin films with sheet resistances reducing by 8 orders of magnitude to as low as ∼1.3 kΩ □−1, suitable for microelectronics, display technology and optoelectronic applications. The in-depth physicochemical characterisation of the products at different stages of GO preparation and reduction allows for further understanding of the process and demonstrates the suitability for industrial production methodologies due to an environmentally-friendly reducing agent, solution processability and no requirement for high temperatures. The presence of the vitamin C lowers the temperature required to thermally reduce the GO into an electrically conducting thin film, making the technique suitable for thermally sensitive substrates, such as low melting point polymers. Simultaneous spray coating and reduction of GO allows for large area deposition of conductive coatings without sacrificing solution processability, often lost through particle agglomeration, making it compatible with industrial processes, and applicable to, for example, the production of sensors, energy devices and flexible conductive electrodes for touchscreens.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Legge, Elizabeth J.
Smith, Christopher T.
Brennan, Barry
Mills, Christopher
Pollard, Andrew J.
Silva, S. Ravi
Date : 7 November 2018
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1039/C8RA08849G
Copyright Disclaimer : © The Royal Society of Chemistry 2018. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Depositing User : Clive Harris
Date Deposited : 12 Sep 2019 09:37
Last Modified : 12 Sep 2019 09:37

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