Petal-shaped ferroferric oxide-based composite wave-absorbing agent, preparation method thereof and wave-absorbing material

Abstract

The invention provides a petal-shaped ferroferric oxide-based composite wave-absorbing agent, a preparation method thereof and a wave-absorbing material. The composite wave-absorbing agent is composedof graphene, petal-shaped ferroferric oxide and polyaniline, the petal-shaped ferroferric oxide is distributed on the graphene, and the polyaniline coats the surfaces of the graphene and the petal-shaped ferroferric oxide and the contact interface of the graphene and the petal-shaped ferroferric oxide. According to the preparation method, a reflux method and a chemical coprecipitation method areutilized, firstly rGO / iron alkoxide is prepared by taking tetrabutylammonium bromide as a structure directing agent for preparing petal-shaped Fe3O4; then organic matters such as a structure-directingagent and the like in the rGO / iron alkoxide and structural water are removed by utilizing a high-temperature calcination method to obtain rGO / f-Fe3O4; and finally, the rGO / f-Fe3O4 is coated by utilizing a chemical oxidative polymerization method and aniline in-situ polymerization to prepare the rGO / f-Fe3O4 coated PANI composite wave absorbing agent. The wave-absorbing agent prepared by the methodhas stronger maximum wave-absorbing strength and wider effective absorption frequency band.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a petal-shaped ferric oxide-based composite wave absorber and a preparation method thereof. The microwave absorbing agent has the characteristics of high temperature stability, low density, strong microwave absorption performance and effective electromagnetic wave absorption frequency bandwidth, and has potential application value in the fields of microwave absorption and electromagnetic shielding. Background technique [0002] Fe 3 o 4 It is the first application, the most widely used and the most mature technology of electromagnetic wave absorber. It has been widely used in many stealth aircraft such as F-117A, B2 and TR1 high-altitude reconnaissance aircraft. Fe 3 o 4 The relative permittivity and relative permeability of the wave absorbing agent are both complex numbers. When the electromagnetic wave is incident on its material, it can produce both dielectric l...

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Problems solved by technology

[0002]Fe3O4 is the first type of electromagnetic wave absorption, widely used in practice, and most mature in technology It has been widely used in many stealth aircraft such as F-117A, B2 and TR1 high-altitude reconnaissance aircraft. The relative dielectric of Fe3O4 wave absorbing agent Both the constant and the relative permeability are complex numbers. When electromagnetic waves are incident on the material, both dielectric loss and magnetic loss can be generated, and it has good wave-absorbing performance, but Fe3O4 The effective electromagnetic wave absorption frequency band of the absorber is narrow and the relative density of the Fe3O4 absorber is high, and Fe3 is used at high temperature O4 is easily oxidized, and its composition will change irreversibly, which will seriously affect its high-temperature electromagnetic wave absorption performance

Graphene's low density, low resistivity, and possible defective polarization relaxation, the dipole polarization relaxation of the group makes graphene have excellent electromagnetic wave absorption characteristics, but its high electron mobility makes it It is difficult to meet the impedance matching when absorbing electromagnetic waves. Therefore, the composite material made of graphene and magnetic Fe3O4 particles can meet the requirements of "thin, light and wide" absorbing materials. , strong" development requirements

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