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X-ray diffraction patterns (CuKα) of: graphene oxide (eGO, with O/C, wt/wt = 0.62); CB sample with the highest BET specific surface area; this CB after oxidation (oCB-3, O/C, wt/wt = 0.91). Patterns in the 2θ range 4–40° (A) and enlarged patterns in the 2θ range 40–85° (B).
