▎ 摘　　要

NOVELTY - A three-dimensional graphene-based composite absorbing material comprises a magnetic nano-iron-based compound and a three-dimensional graphene. The magnetic nano-iron-based compound is uniformly grown in the three-dimensional graphene sheet structure. The magnetic nano-iron-based compound is one or two of iron, iron carbide, iron(II,III) oxide, nickel ferrite, barium ferrite and cobalt ferrite. The magnetic nano-iron-based compound has a size of 30-500 nm, and is in a dispersed state. The morphology of the nano-iron-based compound is spherical or nearly spherical, and is uniformly loaded in the graphene sheet structure. USE - Three-dimensional graphene-based composite absorbing material. ADVANTAGE - The three-dimensional graphene-based composite absorbing material is prepared by a simple method in short period and low cost under controlled reaction condition, and has wide wave-absorbing frequency band and high wave-absorbing strength, and excellent dielectric loss, magnetic loss and absorbing properties at low-frequency region. DETAILED DESCRIPTION - A three-dimensional graphene-based composite absorbing material comprises a magnetic nano-iron-based compound and a three-dimensional graphene. The magnetic nano-iron-based compound is uniformly grown in the three-dimensional graphene sheet structure. The magnetic nano-iron-based compound is one or two of iron, iron carbide, iron-cobalt alloy (FexCoy), iron-nickel alloy (FexNiy), iron-cobalt-nickel alloy (FexCoyNiz), iron-nickel-molybdenum alloy (FexNiyMoz), iron-silicon alloy (FexSiy), iron-silicon-aluminum alloy (FexSiyAlz), iron-cobalt-niobium-vanadium alloy (FexCoyNbzVm), iron-cobalt-cerium alloy (FexCoyCez), iron-cobalt-yttrium alloy (FexCoyYz), iron-cobalt-nitrogen alloy (FexCoyNz), iron-copper-niobium-silicon-boron alloy (FexCuyNbzSimBn), iron(II,III) oxide, nickel ferrite, barium ferrite, cobalt ferrite, iron-cobalt-nickel oxide alloy (FexCoyNizO) iron-lanthanum-strontium-zinc oxide alloy (FexLaySrzZnmO), iron-cobalt sulfide alloy (FexCoyS), and iron-nickel sulfide alloy (FexNiyS), where the chemical formulas of x, y, z, m and n in the above magnetic nano-iron-based compound refer to the stoichiometric number of each element in the compound, which is a controllable value. The magnetic nano-iron-based compound has a size of 30-500 nm, and is in a dispersed state. The morphology of the nano-iron-based compound is spherical or nearly spherical, and is uniformly loaded in the graphene sheet structure. An INDEPENDENT CLAIM is included for a method for preparing the three-dimensional graphene-based composite absorbing material.