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Published April 2014 | Supplemental Material
Journal Article Open

Large scale production of highly conductive reduced graphene oxide sheets by a solvent-free low temperature reduction

Abstract

A novel one-pot process that can produce freestanding reduced graphene oxide (RGO) sheets in large scale through a mechanochemical method is presented, which is based on a 1:1 adduct of hydrazine and carbon dioxide (H_3N^+NHCO_2^−, solid hydrazine). We were able to synthesize RGO sheets by grinding solid hydrazine with graphene oxide (GO), followed by storing the mixed powder at 50 °C for 10 min. No solvents, nor large vessels, nor post-annealing at high temperatures are required. The resulting RGO sample was characterized by elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, Brunauer–Emmett–Teller measurement, thermo gravimetric analysis, Fourier transform infrared spectroscopy, solid state nuclear magnetic resonance spectroscopy, and conductivity measurement. It exhibits excellent conductivity and possesses a high specific surface area. This reduction method was successfully applied for the fabrication of inkjet-printed RGO devices on a flexible substrate.

Additional Information

© 2013 Elsevier Ltd. Received 7 October 2013. Accepted 10 December 2013. Available online 16 December 2013. N.H.H. thanks the Korea CCS R&D Centre grant (2013M1A8A1035853) and the Converging Research Center Program (2012K001486) funded by the National Research Foundation in Korea. H.C. and K.S. acknowledge support from the Mid-career Researcher Program by the National Research Foundation in Korea. Their contract numbers are 2011-0017605 for H.C. and 2011-0017539 for K.S. Measurements of XPS, SEM, and BETwere carried out at the Korea Basic Science Institute.

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