▎ 摘　　要

NOVELTY - The film (1) has graphene oxide nanosheets (5-7) whose stacked layers are oriented parallel to a film surface and oriented perpendicular to the film surface. The stacked layers of graphene oxide nanosheets are doped with effective amount of dopant to absorb and reflect electromagnetic radiation at frequencies ranging from 1-12 giga-herts. The stacked layer of graphene oxide nanosheets is placed on a flexible substrate, where the free-standing film is placed on a metal or alloy substrate and a conductive ceramic substrate. USE - Graphene oxide free-standing film for use in an electromagnetic interference shielding gasket of an electrical or electronic device (all claimed), for absorbing and reflecting electromagnetic radiation at specified microwave frequencies. Uses include but are not limited to computers, mobile and landline telephones, TVs, microwave ovens, radios, personal digital assistants, digital music players, medical instruments, automobiles, and aircraft. ADVANTAGE - The stacked layers of graphene oxide nanosheets are corrugated with greater surface area than non-corrugated nanosheets of comparable size contributing to greater electrical conductivity and electromagnetic radiation shielding effectiveness. The film decreases absorption loss and shielding effectiveness of the film with increased specified frequency ranges so that reflection loss remained mostly unchanged. The film is provided with increased thickness to enhance absorption and multiple internal reflections, thus obtaining higher shielding effectiveness. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for making free-standing film (2) a method for shielding electromagnetic radiation by using a free-standing film. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of graphene oxide nanosheets oriented parallel to and perpendicular to a surface of a graphene oxide free-standing film comprising the nanosheets. Graphene oxide free-standing film (1) Film top surface (2) Film bottom surface (3) Film horizontal cross-section (4) Graphene oxide nanosheets (5-7)