▎ 摘　　要

NOVELTY - Preparing graphene film comprises (i) adding graphene oxide into the mixed solvent, stirring and dissolving under ultrasonic vibration to obtain precursor liquid; (ii) adding spherical metal particles or sheet metal into the precursor liquid, stirring under ultraviolet irradiation and carrying out photocatalytic weak reduction reaction, incubating and layering to obtain upper layer solution weakly reduced graphene colloid, where the metal is zinc, copper, titanium or titanium-6-aluminum-4-vanadium; (iii) coating the weakly reduced graphene colloid on the substrate to obtain weakly reduced graphene film attached to the surface of the substrate; and (iv) placing the weakly reduced graphene film attached to the surface of the substrate in a closed container, adding hydriodic acid to carry out the reduction reaction and drying in a vacuum. USE - The method is useful for preparing graphene film. ADVANTAGE - The method improves the quality of the graphene film, avoids the damage of the graphene film and expands the size range of the graphene film. DETAILED DESCRIPTION - Preparing graphene film comprises (i) adding graphene oxide into the mixed solvent, stirring and dissolving under ultrasonic vibration to obtain precursor liquid, where the concentration of graphene oxide in the precursor liquid is 0.1-2 mg/ml; (ii) adding spherical metal particles or sheet metal into the precursor liquid, stirring under ultraviolet irradiation and carrying out photocatalytic weak reduction reaction, incubating and layering to obtain upper layer solution weakly reduced graphene colloid, where the metal is zinc, copper, titanium or titanium-6-aluminum-4-vanadium; (iii) coating the weakly reduced graphene colloid on the substrate to obtain weakly reduced graphene film attached to the surface of the substrate; and (iv) placing the weakly reduced graphene film attached to the surface of the substrate in a closed container, adding hydriodic acid to carry out the reduction reaction and drying in a vacuum, where the process of the reduction reaction is carried out by dropping hydroiodic acid onto the weakly reduced graphene film attached to the surface of the substrate, sealing the container and placing in a vacuum oven to heat, volatilizing hydriodic acid and reacting with the weakly reduced graphene film.