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We evaluated graphene oxides (GOs) synthesized by different methods in terms of magnetism and chemical structure. GO samples were synthesized by Brodie and Hummers methods, which are labeled as BGO and HGO, respectively. The temperature dependence of magnetic susceptibility indicates an order of magnitude larger localized spin concentration of HGO (Ns=2×1019) than that of BGO (Ns=2×1018). The FT-IR...
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