▎ 摘　　要

NOVELTY - A conductive polymer film is prepared using conductive solvent, conductive polymer monomer and supporting electrolyte. A metal foil is dipped into diluted aqueous solution of graphene oxide for 15-30 minutes, and the foil is removed and dried in air, to obtain metal foil-deposited graphene film. The obtained metal foil-deposited graphene film is added to an etching solution, etched and graphene film is deposited on conductive substrate surface of obtained conductive polymer film, to obtain composite film. USE - Preparation of conductive polymer-graphene composite electrochromic film (claimed). ADVANTAGE - The method efficiently provides conductive polymer-graphene composite electrochromic film by simple method. DETAILED DESCRIPTION - A conductive polymer film is obtained by adding a conductive solvent, a conductive polymer monomer having initial concentration of 0.0005-0.01 mol/L and a supporting electrolyte having concentration of 0.001-0.1 mol/L to a three-electrode electrolysis cell, carrying out polymerization reaction at 1.2-1.5 V by potentiostatic method in presence of indium tin oxide conductive glass electrode substrate or flexible indium tin oxide-PET as working electrode, gold or platinum electrode as auxiliary electrode, calomel electrode or silver-silver chloride electrode as reference electrode, controlling potential of the working electrode to -0.4 V to -0.6 V after completion of polymerization, de-doping for 100-200 seconds, cleaning working electrode, drying in a vacuum oven, and forming conductive polymer film on conductive substrate. The electrolytic solvent is acetonitrile and/or methylene chloride. The conductive polymer is obtained using monomer chosen from 4,4',4"-tri(thiophene)triphenylamine, 1,4-bis(3-thienyl)benzene, 3,4-ethylene dioxythiophene, thiophene and aniline. The supporting electrolyte is tetrabutyl ammonium perchlorate, lithium perchlorate or tetrabutyl ammonium fluoroborate. Concentrated sulfuric acid (A), potassium persulfate, phosphorus pentoxide and graphite powder are reacted at 75-85 degrees C for 6-8 hours, filtered, and obtained cake is washed using deionized water and dried to obtain pre-oxidized graphite. Concentrated sulfuric acid (B) is added to obtained pre-oxidized graphite, and sodium nitrate and potassium permanganate are gradually added at 0-5 degrees C and reacted for 2-3 hours. The resultant mixture is cooled to 0-5 degrees C, and deionized water and 30-40 wt.% hydrogen peroxide solution are added to quench the reaction. The reaction mixture is centrifuged and cleaned to obtain graphene oxide. Obtained graphene oxide is added to deionized water and ultrasonically processed for 3-6 hours to obtain graphene oxide solution. The obtained solution is then diluted to obtain dilute aqueous solution of graphene oxide, such that the concentration of oxidized graphene is 0.1-0.5 mg/L. A metal foil is then dipped into the diluted aqueous solution of graphene oxide for 15-30 minutes, and the foil is removed and dried in air, to obtain metal foil-deposited graphene film. The mass ratio of graphite powder, potassium persulfate and phosphorus pentoxide is 1:2-3:2-3. The content of concentrated sulfuric acid is 10-14 ml/g with respect to amount of graphite powder. The mass ratio of graphite powder, sodium nitrate and potassium permanganate is 1:0.6-1:3-5. The amount of concentrated sulfuric acid (B) is 32-36 ml/g with respect to volume of graphite powder. The volume of deionized water is 50-100 ml/g with respect to amount of graphite powder. The concentration of 30-40 wt.% aqueous solution of hydrogen peroxide is 4-6 ml/g with respect to amount of graphite powder. The obtained metal foil-deposited graphene film is added to an etching solution, etched and graphene film is deposited on conductive substrate surface of obtained conductive polymer film, to obtain composite film.