▎ 摘　　要

NOVELTY - Preparing foldable graphene film involves preparing an graphite oxide suspension having a mass concentration of 0.1-150 mg/mL, adding a reducing agent to the graphite oxide suspension and uniformly stirring the mixture to obtain a mixed solution of the graphite oxide and the reducing agent, where the concentration of the reducing agent is 47-58 wt.% and the mass ratio of the reducing agent to the oxidized graphite is 6-27. USE - Method for preparing foldable graphene film (claimed). ADVANTAGE - The method enables to prepare foldable graphene film, that has enlarged specific surface area, while forming a loose multilayer structure inside the graphene film, which reduces the agglomeration of the graphene and improves the quality of the graphene film. DETAILED DESCRIPTION - Preparing foldable graphene film involves preparing an graphite oxide suspension having a mass concentration of 0.1-150 mg/mL, adding a reducing agent to the graphite oxide suspension and uniformly stirring the mixture to obtain a mixed solution of the graphite oxide and the reducing agent, where the concentration of the reducing agent is 47-58 wt.% and the mass ratio of the reducing agent to the oxidized graphite is 6-27. The substrate is ground, polished and the mixed solution of the graphite oxide and the reducing agent is evenly coated on the substrate after the cleaning and then kept at a temperature of 50-80 degrees C for 1-4 hours to obtain the foldable graphene film.