▎ 摘　　要

NOVELTY - Controlling surface potential of graphene-based material comprises dispersing graphite powder in solvent, sonicating to obtain graphene oxide dispersion; adding oxidizing or reducing agent and/or specific functional group-containing chemical reagent, ultrasonically dispersing, and mixing; pouring into round bottom flask, placing into water bath, and refluxing while magnetically stirring; filtering, high-speed centrifuging, washing, centrifuging, and drying; and dispersing in ultrapure water, ultrasonically dispersing, and adjusting pH value with hydrochloric acid and aqueous ammonia. USE - Method for controlling surface potential of graphene-based material (claimed). ADVANTAGE - The low cost method is simple and suitable for mass production. DETAILED DESCRIPTION - Controlling surface potential of graphene-based material comprises: (A) dispersing 0.05-1 mg/ml graphite powder in solvent, sonicating for 0.5-2 hours to obtain graphene oxide dispersion; (B) adding oxidizing or reducing agent and/or specific functional group-containing chemical reagent, ultrasonically dispersing for 5-30 minutes, and mixing; (C) pouring into round bottom flask, placing into water bath at 35-95 degrees C, and refluxing while magnetically stirring for 0-24 hours; (D) filtering, high-speed centrifuging, washing, centrifuging, and drying to 55-80 degrees C; and (E) dispersing in 0.05-1 mg/ml ultrapure water, ultrasonically dispersing for 5-30 minutes, and adjusting pH value with 0.1 M hydrochloric acid and 0.1 M aqueous ammonia.