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. 2017 Jan 17;7:40796. doi: 10.1038/srep40796

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(a) Comparison of copper foil before (left) and after (right) the 4–6 carbophene film was coated. (b) Comparison of quartz glass sheet before (left) and after (right) the 4–6 carbophene film was coated. (c) The SEM (scanning electron microscope) image of the 2D carbon crystal film separated from copper foil. (d) The SEM image of the 2D carbon crystal film separated from quartz glass sheet. After the carbon films of the 2D crystal are separated from the copper foil and quartz glass sheet, transparent carbon films of 4–6 carbophene are obtained. (e,f) The 4–6 carbophene films separated from copper foil.