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Graphene, a two-dimensional monolayer of sp2-bonded carbonatoms, has attracted increasing attention [1] owing to its excellent electrical and thermal conductivities [2,3], great mechanical strength [4], high specific surface area [5] and potentiallylow production cost [6]. It has shown potential applications in fabricating electronic devices [7], sustainable energy storage and conversion devices [8], sensors [9], and nanocomposites [10,11].Graphene oxide (GO) is also a two-dimensional carbon material with similar one-atom thickness but with a large number of hydrophilic oxygenated functional groups including hydroxyl (-OH), epoxy ( -C- O- C- ), carbonyl (- C =O) and carboxyl ( -COOH) groups [12]. These groups make GO sheets hydrophilic and dramatically improve their miscibility with polymer matrix.
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