▎ 摘　　要

NOVELTY - The preparation of three-dimensional network structure zinc oxide/erbium-graphene oxide film involves adding potassium nitrate or sodium nitrate, concentrated sulfuric acid and crystalline flake graphite to container, stirring, dripping potassium permanganate, stirring, transferring to a water bath, stirring, adding deionized water to the mixture, adding hydrogen peroxide to the mixed solution, washing the precipitate with water, and drying to obtain graphene oxide, washing the conductive glass with detergent and water, and cleaning with the mixed solution of acetone and ethanol. USE - Preparation method of three-dimensional network structure zinc oxide/erbium-graphene oxide film. ADVANTAGE - The method enables preparation of three-dimensional network structure zinc oxide/erbium-graphene oxide film with strong binding force, excellent synergistic effect of zinc oxide and graphene, and excellent performance, by simple, economical and environmentally- friendly process. DETAILED DESCRIPTION - The preparation method of three-dimensional network structure zinc oxide/erbium-graphene oxide film involves (1) adding potassium nitrate or sodium nitrate, concentrated sulfuric acid and crystalline flake graphite to the container, strongly stirring under ice water bath condition by improved Hummers method, where the mass ratio of the potassium nitrate or sodium nitrate, concentrated sulfuric acid and crystalline flake graphite is (1-2):(80-100):1, stirring for 30-60 minutes, dripping potassium permanganate according to potassium permanganate and potassium nitrate mass ratio of (4-6):1, stirring for 30-60 minutes, transferring to a water bath at 30-40 degrees C, stirring for 1.5-2.5 hours, where the dripping rate is 1-3 drops/second, adding deionized water to the mixture according to the mixture and deionized water mass ratio of 1:(1.2-1.5), adding 10-30 %mass hydrogen peroxide to the mixed solution until the residual oxidant is reduced to remove the supernatant, and washing the precipitate with deionized water to neutral, and drying to obtain graphene oxide, (2) washing the conductive glass with detergent and deionized water, ultrasonically cleaning with the mixed solution of acetone and ethanol in mass ratio of 1:1, soaking in 2-3 %mass silane coupling agent ethanol solution for 20-30 minutes, and drying at 80-100 degrees C for 30-40 minutes, (3) preparing graphene oxide obtained in the step (1) into an aqueous solution of 1-3 mg.ml-1, adding 0.1 M potassium chloride as a supply electrolyte, indium tin oxide glass substrate, platinum film, and a saturated calomel electrode as a working electrode, an auxiliary electrode and a reference electrode, and performing electrochemically reduced deposition at -0.9 to -1.2 V for 200-400 seconds, and performing cyclic voltammetry scans after the deposition is completed in 0.1 M potassium chloride at a rate of 50 mV/second and 0 to -1.5 V for 10-15 cycles to prepare electrochemically reduced deposited erbium-graphene oxide film, and (4) taking erbium-graphene oxide/indium tin oxide, platinum sheet, and saturated calomel electrode as working electrode, auxiliary electrode and reference electrode, taking 0.05-0.2 M zinc nitrate hexahydrate as an electrolyte, and depositing at 60-70 degrees C for 5-20 minutes -0.9 to -1.2 V.