▎ 摘　　要

NOVELTY - Method for preparing graphene film involves (i) preparing a graphene oxide dispersion, (ii) placing the graphene oxide dispersion on a substrate to prepare a graphene oxide dispersion film, (iii) freeze-drying the dispersion film to prepare a graphene oxide film and (iv) irradiating the graphene oxide film with a laser. USE - The method is useful for preparing graphene film. ADVANTAGE - The method reduces laser power greatly, can use a low-power laser with a power as low as 1 mW, adopts one-step forming of reduced graphene and simple process, is cost-effective, environmentally-friendly and suitable for large-scale production and provides the graphene film with an internal structure which is three-dimensional and porous and has high specific surface area. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the graphene film prepared by the above method.