▎ 摘　　要

NOVELTY - Preparing carbon nano tube/graphene oxide/nano iron oxide (Fe3O4) sandwich hybrid wave-absorbing thin film (F1) involves: preparing modified graphite oxide by using Hummers method; preparing graphene oxide-carbon nano-tube aqueous solution; preparing nano Fe3O4 dispersion liquid; adding graphene oxide-carbon nano-tube aqueous solution into vacuum suction filter device, then adding nano Fe3O4 dispersion liquid to obtain film (F1); and then subjecting the (F1) into stainless steel mold, putting the mold into vacuum oven at 200 degrees C for 2-8 hours, and then taking the film. USE - For preparing carbon nano tube/graphene oxide/nano Fe3O4 sandwich hybrid wave-absorbing thin film (claimed). ADVANTAGE - The electrical conductivity of carbon nano tube/graphene oxide/nano Fe3O4 sandwich hybrid wave-absorbing thin film obtained by the present method is 100-5000 S/m. DETAILED DESCRIPTION - Preparing carbon nano tube/graphene oxide/nano iron oxide (Fe3O4) sandwich hybrid wave-absorbing thin film involves: (a) preparation of modified graphite oxide by using Hummers method: taking graphite oxide adding plasma water, ultrasonically dispersing for 20-180 minutes to form uniform brown color graphene oxide solution, and then collecting the supernatant after centrifugation, where concentration of graphite oxide is 0.01-3 wt.%; (b) preparation of graphene oxide-carbon nano-tube aqueous solution: adding graphene oxide solution into carbon nano-tube, and magnetically stirring it for 30-180 minutes, ultrasonically dispersing for 10-60 minutes, and then collecting the supernatant after centrifugation, where the carbon nano-tube is single-wall carbon nano-tube, multi-wall carbon nano-tube or functionalized carbon nano-tube, where the weight ratio of the graphene oxide to carbon nano-tube is 1:1-10:1, and the concentration of carbon nano-tube is 0.01-0.3 wt.%, and the concentration of graphene oxide is 0.01-3 wt.%; (c) preparing nano Fe3O4 dispersion liquid: adding nano Fe3O4 into mixture of water and alcohol solution, ultrasonically processing for 1-3 hours to obtain homogeneous solution of nano Fe3O4, where the concentration of Fe3O4 is 0.01-1%, and the volume ratio of alcohol and water is 1:1 to 1:5, and particle size of nano Fe3O4 is 5-30 nm; (d) preparing carbon nano tube/graphene oxide/Fe3O4 sandwich hybrid wave-absorbing thin film using vacuum suction device: taking one half graphene oxide-carbon nano-tube aqueous solution, adding it into vacuum suction filter device, then adding nano Fe3O4 dispersion liquid into the device, then adding the rest of graphene oxide-carbon nano-tube aqueous solution; and (e) subjecting the carbon nano tube/graphene oxide/Fe3O4 sandwich hybrid wave-absorbing thin film into stainless steel mold, putting the mold into vacuum oven at 200 degrees C for 2-8 hours, and then taking the film.