▎ 摘　　要

NOVELTY - Preparation of graphene oxide involves (1) adding potassium permanganate, concentrated sulfuric acid and phosphoric acid in a mass ratio of 0.4:6:26 to the container, stirring well, obtaining a mixture, (2) adding graphite powder, potassium permanganate in a mass ratio of 1:4, adding graphite powder to the mixture, stirring until there are no visible solid particles, ultrasonically dispersing at 5-30 degrees C until the graphene is fully oxidized, adding deionized water, stirring well, vacuum filtrating, obtaining a solid product and a filtrate, using filter paper in the vacuum suction filtration is a microporous membrane, (3) subjecting solid product to multiple washings and vacuum filtration using deionized water, collecting graphene oxide, washing with acetone, and drying in an oven. USE - Preparation of graphene oxide for graphene oxide/nanocellulose conductive flexible film (claimed). ADVANTAGE - The prepared graphene oxide/nanocellulose conductive flexible film has excellent flexibility and bending resistance, high folding strength, high tensile strength, excellent electrical conductivity and compatibility with other materials, and is economical. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) graphene oxide/nanocellulose conductive flexible film, which comprises 5-95 %mass graphene oxide, and 5-95 %mass nanocellulose; and (2) preparation of graphene oxide/nanocellulose conductive flexible film, which involves (a) adding graphene oxide to deionized water, ultrasonically dispersing at 38-42 kHz, obtaining a graphene oxide dispersion, adding cellulose nanofiber to deionized water, ultrasonically dispersing at 18-23 kHz using probe ultrasound system, obtaining a nanocellulose dispersion, (b) mixing graphene oxide dispersion and the nanocellulose dispersion, ultrasonically dispersing at 38-42 kHz for 1-2 hours, obtaining a graphene oxide/nanocellulose mixed dispersion, subjecting to vacuum filtration.