▎ 摘　　要

NOVELTY - Preparing ferroso ferric oxide/graphene oxide hybrid nanopaper comprises e.g. activating carboxy groups of graphene oxide and modifying nanoparticles by dispersing the graphene oxide aqueous solution in deionized water by ultrasonic dispersion, adding 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) and stirring to obtain a carboxy activated graphene oxide solution, the total volume of the graphene oxide and deionized water is 100 ml, the mass ratio of the graphene oxide aqueous solution to the EDC and NHS is 10:2-5:2-4, adding ferroso ferric oxide to a mixed solution of ethanol and water for ultrasonic dispersion, protecting under nitrogen, adding gamma -aminopropyltriethoxysilane dropwise, after the reaction for 2-4 hours, washing the brown precipitate multiple times with deionized water and absolute ethanol, vacuum drying at 60-100 degrees C for 24-48 hours to obtain organically modified ferroso ferric oxide nanoparticles. USE - The method is useful preparing ferroso ferric oxide/graphene oxide hybrid nanopaper. ADVANTAGE - The method: adopts hybrid nanopaper with uniform nanoparticle distribution and greatly improves wave absorbing performance; adopts epoxy resin as the auxiliary film to further improve the processing technology and mechanical properties of the absorbing material. DETAILED DESCRIPTION - Preparing ferroso ferric oxide/graphene oxide hybrid nanopaper comprises (i) activating carboxy groups of graphene oxide and modifying nanoparticles by dispersing the graphene oxide aqueous solution in deionized water by ultrasonic dispersion, adding 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) and stirring to obtain a carboxy activated graphene oxide solution, the total volume of the graphene oxide and deionized water is 100 ml, the mass ratio of the graphene oxide aqueous solution to the EDC and NHS is 10:2-5:2-4, (ii) adding ferroso ferric oxide to a mixed solution of ethanol and water for ultrasonic dispersion, protecting under nitrogen, adding gamma -aminopropyltriethoxysilane drop wise, after the reaction at 85-100 degrees C for 2-4 hours, thermal preservation for 30-60 minutes, washing the brown precipitate multiple times with deionized water and absolute ethanol, vacuum drying at 60-100 degrees C for 24-48 hours to obtain organically modified Fe3O4 nanoparticles, the volume ratio of ethanol to water is 1:1-3, the ratio of ferroso ferric oxide and the substance gamma -aminopropyltriethoxysilane is 1:2-4, (iii) adding the organically modified ferroso ferric oxide nanoparticles to the carboxy-activated graphene oxide solution, the ratio of the mGO: mFe3O4 is 8-5:2-5, ultrasonically obtaining ferroso ferric oxide/graphene oxide mixed solution, pouring the mixed solution on a flat mold, placing in a vacuum oven at 60-100 degrees C for 24-48 hours to obtain pure ferroso ferric oxide/graphene oxide hybrid carbon nanopaper, and (iv) applying the mixed solution of E-51 epoxy resin and amine curing agent on the surface of the ferroso ferric oxide/graphene oxide hybrid carbon nanopaper, waiting for the resin to cure completely at room temperature to obtain ferroso ferric oxide/graphene oxide flexible hybrid carbon nanopaper, where the mass ratio of the mixed solution of the E-51 epoxy resin and the amine curing agent is 100:32-35. An INDEPENDENT CLAIM is also included for preparing hybrid nanopaper/ epoxy/carbon fiber composite material by using a ferroso ferric oxide/graphene oxide hybrid nanopaper comprising impregnating each layer of carbon fiber cloth first with a resin mixture containing curing agent to prepare a prepreg, sequentially stacking the pre-impregnated carbon cloth to the number of design layers, after completion, spreading the prepared ferroso ferric oxide/graphene oxide flexible nanopaper on its surface, placing at room temperature for 10-15 hours, placing into a plate press for pressing, the pressing conditions are 60 degrees C for 1 hour, 80 degrees C for 2 hours, 100 degrees C for 1 hour, 120 degrees C for 1 hour, cooling the furnace to obtain ferroso ferric oxide/graphene oxide hybrid nano paper/EP /CF composite materials, where the curing agent-containing resin mixture is a mixed solution of E-51 epoxy resin and amine curing agent, and the mass ratio is 100:32-35.