▎ 摘　　要

NOVELTY - Natural flake graphite and mixed acid are mixed, and intercalation agent is added, and processed to obtain layered graphite. Layered graphite is processed in microwave apparatus, dispersed in water and ultrasonically processed to obtain aqueous solution of graphene. Aqueous solution of graphene is centrifuged and redispersed in solvent to obtain dilute dispersion of graphene. Dispersion of graphene is ultrasonically processed, and filtered through cellulose filter membrane to form graphene film. Graphene film is polished and heated to obtain high-quality graphene conductive film. USE - Preparation of high-quality graphene conductive film (claimed). ADVANTAGE - The method efficiently and economically provides high-quality graphene conductive film by simple method without using strong oxidizing agent and without affecting the environment. DETAILED DESCRIPTION - Natural flake graphite and mixed acid are mixed in a reactor, and intercalation agent is added, reacted at 35 degrees C for 4-12 hours and filtered. The resultant mixture is washed with water and pH is adjusted to 7. The obtained material is then dried at 60 degrees C to obtain layered graphite. The ratio of natural flake graphite, mixed acid and intercalating agent is 1 g:3-6 ml:1-4 g. The layered graphite is processed in microwave apparatus for 1-5 minutes to obtain microwave-treated graphite. The microwave-treated graphite is dispersed in water, and ultrasonically processed in ultrasound power of 300-500 W for 30-60 minutes to obtain 0.5-2 mg/ml aqueous solution of graphene. The aqueous solution of graphene is centrifuged at 5000-6000 rpm for 10-20 minutes to obtain solid. The obtained solid is redispersed in solvent to obtain dilute dispersion of graphene with concentration of 5-20 mg/ml. The dispersion of graphene is ultrasonically processed at 150-300 W for 10-20 minutes, and filtered through cellulose filter membrane to form graphene film. The surface of obtained graphene film is polished and heat-treated to obtain high-quality graphene conductive film.