Production method of graphene foam/magnetic nanowire composite wave-absorbing material

Abstract

The invention relates to a production method of a graphene foam / magnetic nanowire composite wave-absorbing material. The production method of the graphene foam / magnetic nanowire composite wave-absorbing material comprises the following steps of producing a graphene oxide aqueous solution, conducting high-speed centrifugation for multiple times by using ethyl alcohol as a solvent to make sure that water is completed replaced, so as to obtain a graphene oxide solution with the low-concentration ethyl alcohol used as the solvent, carrying out a one-step hydrothermal reaction to produce three-dimensional porous graphene oxide foam, and then carrying out a secondary hydrothermal reaction to synthesize one-dimensional magnetic nanowires in a porous structure formed by two-dimensional graphene sheet layers, so as to form a rich structure which integrates multidimensional scaling. Electrical loss and magnetic loss of the graphene foam / magnetic nanowire composite wave-absorbing material are given play to, and an electromagnetic coupling effect, an interfacial effect, a nanometer effect and a quantum effect are used at the same time, so that excellent wave absorbing performance is obtained, wide-frequency high-strength absorption of electromagnetic waves is achieved, and the problems of electromagnetic interference, electromagnetic radiation and the like can be effectively solved.

Description

technical field [0001] The invention relates to a preparation method of a wave-absorbing material, in particular to a preparation method of a graphene foam / magnetic nanowire composite wave-absorbing material. Background technique [0002] Although traditional ferrite, ceramic-based wave absorbers and other materials have good electromagnetic properties, they cannot meet the needs of practical applications due to their high density, heavy mass, and limited wave-absorbing performance. Therefore, the development of new wave-absorbing materials with light weight, broadband and high strength can solve practical problems. Graphene is a new two-dimensional nanomaterial discovered for the first time in 2004. It has unique physical and chemical properties. Compared with traditional carbonaceous materials, graphene not only has a lower density and a larger specific surface area, but also has high electrical conductivity and thermal conductivity. These characteristics of stability ena...

AI Technical Summary

Problems solved by technology

Graphene is a new two-dimensional nanomaterial discovered for the first time in 2004. It has unique physical and chemical properties. Compared with traditional carbonaceous materials, graphene not only has a lower density and a larger specific surface area, but also has high electrical conductivity and thermal conductivity. These characteristics of stability enable graphene to replace traditional carbon materials and become a new type of wave-absorbing material. The main electromagnetic wave attenuation mechanism of simple graphene is electrical loss, so the wave-absorbing performance is not good, and the electromagnetic wave absorption of graphene materials is further improved. Performance is an open issue

[0003] Chinese patent CN107177053A discloses a nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure wave-absorbing material and its preparation method. A hydrothermal reaction is carried out in solution A, and after the reaction, the silicon carbide fiber cloth is taken out for annealing treatment to obtain a nickel cobaltate-silicon carbide fiber multi-scale reinforcement; solution A is obtained by adding cobalt nitrate, nickel nitrate and urea into water and stirring evenly; The polyamic acid solution is evenly painted on the outer surface of the nickel cobaltate-silicon carbide fiber multi-scale reinforcement, and then stacked neatly to obtain the prefabricated part; the prefabricated part is subjected to repeated processes of vacuuming-pressure maintaining-pressure relief several times, Nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure wave-absorbing material is obtained by molding, but the preparation method of this patent is relatively complicated, requiring multiple vacuum-holding-pressure-relieving processes

Images