Study on the reduction of graphene oxide with ascorbic acid and tannic acid and its characteristics
Green reducing agents,ascorbic acid(AA)and tannic acid(TA),were used to reduce graphene oxide(GO),yielding two types of reduced graphene oxide(RGO)and TA-modified reduced graphene oxide(RGOA),respectively.It was found that both AA and TA could effectively reduce GO in aqueous solutions through the characterization and testing of RGO and RGOA.The prepared RGO and RGOA exhibited significant differences in morphology,hydrophilicity,and conductivity.RGO was a fragmented and disordered solid structure with a larger specific surface area.The electrical conductivity was significantly increased,and the reduction degree was higher than RGOA,but the hydrophilicity was poor.In contrast,RGOA presented an expanded and curled flocculent structure due to the introduction of the polyphenolic hydroxyl groups of TA,and the electrical conductivity was improved slightly and the hydrophilicity was enhanced obviously.
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