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. 2015 Jun 1;6:7258. doi: 10.1038/ncomms8258

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(a) Illustration of the preparation of the g-CN materials. (b) TEM images of g-CN_800 °C, scale bar 100 nm. (c) SEM images of g-CN_800 °C, scale bar 1μm. (d) The pore size distribution of g-CN_800 °C and RGO and their contribution to SSA. (e) XRD patterns of g-CN_550 °C and g-CN_800 °C.