▎ 摘　　要

NOVELTY - Graphene porous film material has a thickness of 125-150 mu m, and pores in the membrane stacked in a flat spindle shape, where the pore size is 6-10 mu m in the vertical direction of the membrane, and 50-100 mu m in the direction of the membrane plane. The quality of the membrane per square centimeter is 0.916-1.209 mg. USE - Graphene porous film material used for preparing terahertz wave shielding layer (claimed). ADVANTAGE - The graphene porous film material has characteristics of smooth surface, good conductivity, light weight, thin thickness, hydrophobicity, and can also form multiple internal reflections of the terahertz wave incident into the material due to the uniform distribution and large number of internal holes, which increases the loss of electromagnetic wave energy, and shows potential to become a terahertz wave shielding material with the characteristics of light, thin, wide, and strong. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene porous film material, which involves: (A) taking appropriate amount of graphene oxide aqueous solution on glass slide; (B) drying naturally to form film with a thickness of 20 mu m; (C) cutting the glass slide together with the graphene oxide film to an appropriate size; (D) placing gaskets, porous nickel foam nets, and glass slides on the graphene in sequence to fix with rubber bands; (E) putting the graphene oxide film into a sealable container with hydrazine hydrate for 3 hours; and (F) putting the graphene porous film into a tube furnace for heat-treating in an argon atmosphere for 30 minutes at 300-500 degrees C. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional microscopic view of a graphene porous film without heat treatment taken by a scanning electron microscope.