▎ 摘　　要

NOVELTY - The preparation method of magnetic nano-material modified graphene film involves (1) dissolving 20-50 parts mass ferric nitrate nonahydrate and 10-20 parts mass bismuth(III) nitrate pentahydrate in 60-80 parts mass anhydrous ethanol, and stirring for 20-30 minutes, (2) transferring the stirred solution to a reactor, reacting, cooling the reactor to room temperature, filtering, washing with anhydrous ethanol and distilled water, drying, and fully grinding to obtain bismuth ferrite nano-particle, (3) adding graphite oxide to anhydrous ethanol, and ultrasonically processing to obtain graphene oxide colloidal suspension, (4) stirring graphene oxide colloidal suspension and bismuth ferrite nano-particle, (5) vacuum filtering the stirred suspension through a microporous filtering film, drying the filter cake in oven, removing the magnetic nano-material modified graphene film from the filter film, and annealing the film under nitrogen atmosphere. USE - Preparation method of magnetic nano-material modified graphene film used for electrode (all claimed). ADVANTAGE - The method enables preparation of magnetic nano-material modified graphene film which does not expand or damage, and with low resistivity, high electron mobility and high thermal conductivity, by simple process. DETAILED DESCRIPTION - The preparation method of magnetic nano-material modified graphene film involves (1) dissolving 20-50 parts mass ferric nitrate nonahydrate and 10-20 parts mass bismuth(III) nitrate pentahydrate in 60-80 parts mass anhydrous ethanol, and stirring for 20-30 minutes, (2) transferring the stirred solution to a reactor, reacting at 180-220 degrees C for 10-12 hours, cooling the reactor to room temperature, filtering, washing with anhydrous ethanol and distilled water, drying at 100-120 degrees C for 5-8 hours, and fully grinding to obtain bismuth ferrite nanoparticles, (3) adding 4-20 parts mass graphite oxide to 20-40 parts mass anhydrous ethanol, and ultrasonically processing with 155-185 W for 60-90 minutes to obtain graphene oxide colloidal suspension, (4) stirring 10-20 parts mass graphene oxide colloidal suspension and 3-6 parts mass bismuth ferrite nanoparticles at 20-25 degrees C for 10-15 minutes, and (5) vacuum filtering the stirred suspension through a microporous filtering film, drying the filter cake in oven at 50-60 degrees C, removing the magnetic nano-material modified graphene film from the filter film at 500-625 degrees C and magnetic field strength of 0-6.89 mA/m, and annealing the film for 20-40 minutes under nitrogen atmosphere.