Composite aerogel functional material based on ferroferric oxide nanowire/graphene oxide interpenetrating structure and preparation method thereof

Abstract

The invention discloses a composite aerogel functional material based on a ferroferric oxide nanowire / graphene oxide interpenetrating structure and a preparation method thereof, and belongs to the field of wave-absorbing functional materials. Based on a one-pot hydrothermal method, a nonionic surfactant is selected to control growth of ferroferric oxide in the one-dimensional direction and regulate and control the dispersion state of a GO solution and nanowires; monodentate thiosulfate is adopted to regulate and control the precipitation reaction speed and the iron reduction degree, and a multifunctional biomass reducing agent is adopted for in-situ assembly of GO; the composite hydrogel is subjected to intermittent circulating freeze-drying post-treatment to form compact ice crystals to prepare the composite aerogel functional material based on a ferroferric oxide nanowire / graphene oxide interpenetrating structure, and therefore, the uniformly dispersed wave-absorbing material integrating multi-dimensional scale is formed, excellent wave-absorbing performance is obtained by utilizing a coupling effect, an interface effect and an impedance matching characteristic while electrical and magnetic loss of the wave-absorbing material is brought into full play, broadband strong absorption of electromagnetic waves by a multifunctional loss mechanism is realized, and the problems of electromagnetic pollution and the like can be effectively solved.

Description

technical field [0001] The invention belongs to the field of wave-absorbing functional materials, and mainly relates to a composite airgel functional material based on ferric oxide nanowire / graphene oxide interpenetrating structure and a preparation method thereof. Background technique [0002] At present, with the widespread use of various electronic devices and components, the safety hazards brought by electromagnetic wave radiation are also deepening day by day, causing adverse effects on people's health. Microwave absorbing materials can effectively absorb electromagnetic waves, convert electromagnetic energy into heat energy, or dissipate electromagnetic waves through interference, so they have attracted widespread attention. Traditional electromagnetic wave absorbing materials, such as ferrite and conductive polymers, have strong microwave absorption properties and can effectively absorb electromagnetic waves. However, these materials have disadvantages such as high d...

AI Technical Summary

Problems solved by technology

Chinese patent [Application No. 201811100210.2] discloses a preparation method of nitrogen-doped reduced graphene oxide airgel absorbing material. Although the graphene airgel is assembled in situ by a simple one-step method, its electromagnetic wave absorption and reflection Loss is only -15dB, poor absorbing performance

However, the preparation process of this invention is relatively long, the dispersion of nanoparticles in graphene airgel needs to be optimized, and the overall absorbing performance is low

[0004] In general, the problems of the wave-absorbing materials reported in the literature are as follows: first, a single graphene aerogel with high conductivity and weak magnetism and a single trioxide tetroxide with high magnetism and weak conductivity Both iron nanowires have the problem of impedance mismatch, and the overall absorbing performance of the two materials is not good; second, the preparation process of the composite absorbing material of graphene and ferroferric oxide nanoparticles is complicated, and it is difficult to meet the needs of industrial production; The magnetic nanoparticles are poorly dispersed and easy to agglomerate, which limits the performance of the composite system; the fourth is that the carbon substrates in carbon-based absorbing materials are usually one-dimensional or two-dimensional structures. Compared with three-dimensional structures, they provide electromagnetic wave reflection inside the material. At the same time, the conductivity is low because no conductive network is formed; fifth, the absorption of electromagnetic waves by nanoparticles only comes from magnetic loss and weak interface polarization loss

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