▎ 摘　　要

NOVELTY - A composite material having absorbing and electromagnetic shielding properties is prepared by using ferroferric oxide, and silicon dioxide, doping ferroferric oxide with silicon dioxide and forming one-dimensional nanosphere chain structure, and embedding reduced graphene oxide layer into the ferroferric oxide doped silicon dioxide. USE - Composite material for civil, military and aerospace applications. ADVANTAGE - The composite material prepared is lightweight, and has wide frequency, high shielding performance with simple preparation method. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite material, which involves using adding 2.028 g ferric chloride hexahydrate, 3.69 g sodium acetate (NaAc), 0.0224 g disodium edetate and 60 mL ethylene glycol to 100 mL reactor liner, stirring the mixture for 2 hours, ultrasonically processing the mixed solution to form stable earthy yellow uniform liquid, packing the reaction system and reacting the mixture in a high temperature at 200 degrees C for 10 hours, cooling naturally and collecting the brown-black precipitated product, ultrasonically washing four times with anhydrous ethanol and deionized water, drying the washed material in an oven at 50 degrees C, adding 0.0258 g ferroferric oxide prepared sample prepared, adding the mixture to a three-necked flask together with 6 mL deionized water, 40 mL absolute ethanol, and 1 mL concentrated aqueous ammonia, ultrasonically processing the mixed solution for 0.5 hours, adding 170 mu L tetraethyl orthosilicate (TEOS) in drops to the stirring system, ultrasonically processing for 20 minutes, taking 20 mL mixed solution in a small beaker and placing at a distance of 2 cm from the center of circular magnet for 3 seconds, placing in a non-magnetic atmosphere and leaving still for 25 minutes, washing the solid precipitate precipitated at the bottom of the beaker three times with absolute ethanol, drying the washed precipitate in an oven at 50 degrees C, adding 40 mg graphene oxide (rGO) to 250 mL round bottom flask and adding 60 mL deionized water, ultrasonically processing for 2 hours to make a uniform solution, placing the solution in a 90 degrees C oil bath, adding 70 mu L hydrazine hydrate, magnetically stirring the mixture for 2 hours, cooling to room temperature and removing the magnets, adding prepared ferroferric oxide nanosphere and ultrasonically processing for 2 hours, centrifuging the mixture three times using ethanol and deionized water, and placing the material in a lyophilizer for freeze-drying.