High yield production of graphene by liquid phase exfoliation of graphite - Condensed Matter > Materials ScienceReport as inadecuate




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Abstract: Graphene is at the centre of nanotechnology research. In order to fullyexploit its outstanding properties, a mass production method is necessary. Twomain routes are possible: large-scale growth or large-scale exfoliation. Here,we demonstrate graphene dispersions with concentrations up to ~0.01 mg-ml bydispersion and exfoliation of graphite in organic solvents such asN-methyl-pyrrolidone. This occurs because the energy required to exfoliategraphene is balanced by the solvent-graphene interaction for solvents whosesurface energy matches that of graphene. We confirm the presence of individualgraphene sheets with yields of up to 12% by mass, using absorptionspectroscopy, transmission electron microscopy and electron diffraction. Theabsence of defects or oxides is confirmed by X-ray photoelectron, infra-red andRaman spectroscopies. We can produce conductive, semi-transparent films andconductive composites. Solution processing of graphene opens up a whole rangeof potential large-scale applications from device or sensor fabrication toliquid phase chemistry.



Author: Y. Hernandez, V. Nicolosi, M. Lotya, F. Blighe, Z. Sun, S. De, I. T. McGovern, B. Holland, M. Byrne, Y. Gunko, J. Boland, P. Nira

Source: https://arxiv.org/







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