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. 2015 Sep 2;5:13689. doi: 10.1038/srep13689

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(a) The AFM image and (b) the cross-sectional profile scanned from point A of the synthesized few-layer graphene. (c) The non-linear transmittance of the synthesized graphene. (d) The Raman spectra of commercial single-layer graphene and hydrogen-free synthesized few-layer graphene.