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. 2017 Jan 31;7:41891. doi: 10.1038/srep41891

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(a) Raman spectra of the plasma-treated graphene nanosheets before and after thermal reduction. (b) The comparison of adhesion force of the plasma-treated graphene nanosheets between before and after thermal reduction. (c) The comparison of friction force of the plasma-treated graphene nanosheets between before and after thermal reduction. Where PLA and TR represent plasma treatment and thermal reduction respectively, The numbers after PLA represent the plasma treatment time (s).