▎ 摘　　要

NOVELTY - Pure graphene composite electromagnetic shielding film is claimed. The electromagnetic shielding film is having density of 0.001-0.1 g/cm3, carbon content of 100 %, and is composed of multiple graphene layers and a graphene microsphere located between the graphene layers, where diameter of the graphene microsphere is 1-5 mu m, graphene layers are formed by planar orientation of graphene sheets overlapping on each other by pi-pi conjugation, the adjacent graphene layers are supported by the graphene microspheres, forming a channel. USE - Used as pure graphene composite electromagnetic shielding film. DETAILED DESCRIPTION - Pure graphene composite electromagnetic shielding film is claimed. The electromagnetic shielding film is having density of 0.001-0.1 g/cm3, carbon content of 100 %, and is composed of multiple graphene layers and a graphene microsphere located between the graphene layers, where diameter of the graphene microsphere is 1-5 mu m, graphene layers are formed by planar orientation of graphene sheets overlapping on each other by pi-pi conjugation, the adjacent graphene layers are supported by the graphene microspheres, forming a channel, and the cross-sectional area of the channel is 10-60% of the total cross-sectional area. An INDEPENDENT CLAIM is also included for preparing pure graphene composite electromagnetic shielding film comprising (i) preparing 0.1-100 mg/ml aqueous graphene oxide solution using 100 pts. wt. graphene oxide having particle size of more than 100 mu m, adding 0.1-10 pts. wt. graphene microspheres, carrying out ultrasonic dispersion, and preparing oxidized graphene film by film-forming method, and then reducing using hydrazine hydrate (reducing agent), (ii) heating obtained graphene film to 800 degrees C at a rate of 0.3 degrees C under inert gas atmosphere, insulating for 0.5-2 hours, (iii) heating to 1300 degrees C at a rate of 2 degrees C under inert gas atmosphere, insulating for 0.5-2 hours, and (iv) heating to 3000 degrees C at a rate of 10 degrees C under inert gas atmosphere, insulating for 0.5-2 hours, then cooling naturally to obtain final product.