Abstract
Free-standing reduced graphene oxide (rGO) papers were prepared by chemical reduction, thermal reduction and combined chemical-thermal reduction, respectively. Four-point probe and nanoindentation experiments were conducted to investigate the electrical and mechanical properties of rGO papers. The rGO paper prepared by soaking in L-ascorbic acid and thermal annealing in argon at 1000 °C (labeled rGO-AsA-T) showed superior electrical and mechanical properties when compared with rGO papers prepared merely by chemical reduction or thermal reduction. The as-prepared rGO-AsA-T paper exhibited an electrical conductivity of 5.7 × 104 S/m, showing an increase of 90% compared to that in the thermally annealed rGO paper and nearly 40 times that of rGO paper reduced by L-ascorbic acid. It was also found that the rGO-AsA-T paper had the lowest elastic modulus of 288 MPa, showing enhanced flexibility. The nearly free voids in rGO-AsA-T paper proved by scanning electron microscopy (SEM) were due to the capillary action in chemical reduction and were significant in improving the electrical conductivity and flexibility of the paper. The rGO-AsA-T paper with high conductivity and flexibility has a promising application in flexible electronics.
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Acknowledgements
This work has been financially supported by the National Natural Science Foundation of China (61774084), by the Priority Academic Program Development of Jiangsu Higher Education Institutions, by the special fund of Jiangsu Province for the transformation of scientific and technological achievements (BA2019047), the open project of Key Laboratory of Materials Preparation and Protection for Harsh Environment, Ministry of Industry and Information Technology (XCA20013-3) and by funding of Jiangsu Innovation Program for Graduate Education (KYCX19_0175).
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Yang, Y., Shen, H., Yang, J. et al. Enhanced Conductivity and Flexibility in Reduced Graphene Oxide Paper by Combined Chemical-Thermal Reduction. J. Electron. Mater. 50, 6991–6999 (2021). https://doi.org/10.1007/s11664-021-09201-2
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DOI: https://doi.org/10.1007/s11664-021-09201-2