▎ 摘　　要

NOVELTY - Double-sided graphene film includes insulating filter membrane (1) and two-layer graphene film (2). A layer of graphene film is adhered to both sides of the insulating filter film respectively to form a structure of graphene film-insulating filter film-graphene film. The insulating filter membrane is flexible, has high adhesion to the double-sided graphene film, and the two-dimensional plane size of the graphene sheet (3) is larger than the pore diameter of the insulating filter membrane pores (4). USE - Double-sided graphene film. ADVANTAGE - The double-sided graphene film is simple to prepare and practical, and convenient for large-scale application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a double-sided graphene film, which involves: (A) using the insulating filter membrane to filter the graphene dispersion through vacuum, and depositing the graphene on the insulating filter membrane to form a thin film, then vacuum freeze-drying, and obtaining the first-side graphene film, and forming a graphene film-insulating filter film structure; (B) inverting the above-mentioned graphene film-insulating filter film structure, and the graphene film on the first side is under the insulating filter film; (C) vacuuming the graphene dispersion liquid again, depositing the graphene on the other side of the insulating filter membrane, and obtaining the second side graphene film after drying; and (D) forming a double-sided graphene film composed of graphene film-insulating filter film-graphene film. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of double-sided graphene film. Insulating filter membrane (1) Two-layer graphene film (2) Graphene sheet (3) Insulating filter membrane pores (4)