▎ 摘　　要

NOVELTY - Preparation of flexible graphene film comprises subjecting graphene oxide film to thermal reduction treatment. The graphene film has porous structure on the thickness orientation of graphene film. The graphene film may be folded and restored where no plastic deformation occurs in the folded portion of the graphene film. The flexible graphene film thickness is 1-500 mu m. USE - Method for preparing flexible graphene film (claimed). ADVANTAGE - The product has excellent flexible and foldable performance; quickly recovers to the original shape without leaving creases; and has elastic body having similar resilience action of folding. The method is simple and convenient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of flexible graphene-based composite film comprising mixing other materials and graphene oxide powder into a film, or mixing other materials and graphite oxide powder by dispersion film-forming treatment, or mixing precursor of other materials with graphite oxide powder to form mixture of precursor and graphene oxide in situ by dispersion liquid film forming or mixing powder and subjecting graphene oxide-based composite film to heat treatment.