▎ 摘　　要

NOVELTY - Composite material comprises a carbon fiber base layer surface loaded with a bonding layer surface formed with a modified graphene oxide material layer. The modified graphene oxide material layer comprises triangular silver nano particles coated with graphene oxide material. USE - The composite material is useful in electromagnetic shielding device (claimed). ADVANTAGE - The composite material: can maintain high absorption loss in a wide absorption frequency band; and has excellent antibacterial properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: Preparing composite material, comprising providing a carbon base cloth and forming a modified graphene oxide material layer on the surface of the bonding layer of the carbon base cloth; and Electromagnetic shielding device comprises the composite material.