▎ 摘　　要

NOVELTY - Sheet iron oxide nanoparticle/multilayer graphene composite material comprises iron oxide nanosheets uniformly dispersed on the surface of the multilayer graphene, where multilayer graphene surface is vertically, parallel and obliquely distributed, and there are gaps between the iron oxide nanosheets. The iron oxide nanosheets are in the shape of a disc, and the size of the disc is uniform, where the thickness of the sheet is 10-20 nm, and the diameter of the circle is 100-200 nm. The multilayer graphene is expanded graphite obtained by ultrasonically treating in a mixed organic solvent. USE - As sheet iron oxide nanoparticle/multilayer graphene composite material. ADVANTAGE - The preparation method is simple and is suitable for industrialized production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the composite material, involving (a) measuring out dimethylformamide and deionized water in a volume ratio of 8:2, uniformly mixing, using as a mixed solvent, weighing expanded graphite, adding to the mixed solvent, and ultrasonically treating to obtain a multilayer graphene dispersion, where the concentration of expanded graphite relative to the mixed solvent is 0.5-2 mg/ml, (b) adding glycerol to the dispersion liquid by measuring the volume ratio of glycerol to the mixed solvent of 0.001-0.003, weighing anhydrous sodium acetate, adding to the dispersion, where the concentration of anhydrous sodium acetate relative to the mixed solvent is 20 mg/ml, and uniformly magnetically stirring to obtain the reaction precursor liquid, (c) putting the reaction precursor liquid in a 90 degrees C water bath under magnetic stirring, weighing high-purity iron powder into the reaction precursor liquid, where the concentration of the iron powder relative to the mixed solvent is 3-5 mg/ml, measuring a dilute nitric acid solution with a concentration of 2 mol/l, and adding to the reaction precursor solution, and the volume ratio of the dilute nitric acid solution to the mixed solvent is 0.15-0.2, obtaining a reaction solution, (d) reacting the reaction solution in a water bath at 90 degrees C under magnetic stirring at a rotation speed of 300 rpm for 5-10 hours, and (e) after cooling the reaction solution, performing centrifugal cleaning, and after drying to obtain a disc-shaped iron oxide nanoparticle/multilayer graphene composite material.