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CN-122002777-A - Preparation method of functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in broadband

CN122002777ACN 122002777 ACN122002777 ACN 122002777ACN-122002777-A

Abstract

A preparation method of a functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in a broadband belongs to the technical field of electromagnetic wave absorption. According to the invention, graphene Gr prepared by an electrochemical stripping method is used as a conductive matrix, and is subjected to functionalization treatment. The Gr/FeOOH intermediate is prepared by loading needle-shaped ferrite FeOOH on the surface of the intermediate by a solution method, and then a layer of flower-shaped molybdenum disulfide MoS 2 is wrapped on the surface of the intermediate by a one-step hydrothermal method, so that the functionalized graphene-based composite wave-absorbing material capable of absorbing electromagnetic waves in a broadband and high-efficiency manner is finally prepared. The Gr/FeOOH@MoS 2 composite material prepared by the method integrates the characteristics of porosity, heterogeneous interface and high dielectric property, solves the internal conflict between electromagnetic wave attenuation and impedance matching, and provides a general strategy for designing a wave absorbing material with adjustable dielectric-magnetic characteristics and meeting broadband absorption, good impedance matching and attenuation constants.

Inventors

  • LIANG BING
  • Ge Wenran

Assignees

  • 沈阳化工大学

Dates

Publication Date
20260508
Application Date
20260330

Claims (9)

  1. 1. A preparation method of a functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in a broadband mode is characterized by comprising the following four steps: S1, dropwise adding a NaAc aqueous solution into a ferrous salt aqueous solution according to a set rate to obtain a mixed solution, heating to a reaction temperature under the conditions of water bath and mechanical stirring for reaction, and sequentially carrying out suction filtration, washing and drying to obtain alpha-FeOOH; s2, carrying out ultrasonic dispersion on graphene Gr and alpha-FeOOH in a reaction medium, carrying out reaction under the conditions of water bath heating and stirring, and then washing and drying a reaction product to obtain Gr/FeOOH; S3, after being dispersed in distilled water in an ultrasonic manner, gr/FeOOH and Na 2 MoO 4 ·2H 2 O、(NH 2 ) 2 CS are transferred into a hydrothermal kettle, a rotary hydrothermal reaction is carried out under the constant temperature condition, and after the reaction is finished, products naturally cooled to room temperature are sequentially centrifugally washed and dried to obtain Gr/FeOOH@MoS 2 ; S4, adding Gr/FeOOH@MoS 2 into melted paraffin, stirring until Gr/FeOOH@MoS 2 is uniformly dispersed to obtain a paraffin mixture, pouring into a mold, and pressing to obtain a paraffin magnetic ring, thus obtaining the functionalized graphene-based composite wave absorbing material capable of efficiently absorbing electromagnetic waves in a broadband.
  2. 2. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves in a broadband mode, which is characterized in that in S1, fe 2+ in ferrous salt aqueous solution and NaAc in NaAc aqueous solution are calculated according to a molar ratio, and Fe 2+ :NaAc= (1:2) - (1:3).
  3. 3. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves in a broadband mode, which is characterized in that in S1, after a ferrous salt aqueous solution is heated to 30-40 ℃ in a water bath, naAc aqueous solution is added dropwise at a rate of 1-2 mL/min; the reaction temperature is 70-85 ℃ and the reaction time is 100-130 min; And drying in a blast drying oven at 50-60 ℃ for 12-24 hours.
  4. 4. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves through broadband according to claim 1, wherein in S2, the mass ratio of Gr to FeOOH is (3:3.5) to (3:4); The reaction medium is a mixed solution composed of DMF and water, wherein the volume ratio of DMF to water= (3:7) to (2:8).
  5. 5. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves in a broadband mode, which is characterized in that in S2, the water bath temperature is 70-85 ℃ and the reaction time is 100-150 min; The drying temperature is 50-60 ℃ and the drying time is 12-24 hours.
  6. 6. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves in a broadband manner according to claim 1, wherein in S3, the mass ratio is calculated ,Gr/FeOOH：Na 2 MoO 4 ·2H 2 O=(1:3)~(1:4),Gr/FeOOH：(NH 2 ) 2 CS=(1:3)~(1:4).
  7. 7. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves in a broadband mode, which is characterized in that in S3, the reaction temperature is 180-200 ℃ and the reaction time is 18-24 h in the process of a rotary hydrothermal reaction, and the rotating speed of reactants is 20-30 r/min; the drying process is that the drying is carried out for 4-12 hours at 50-60 ℃.
  8. 8. The preparation method of the functionalized graphene-based composite wave-absorbing material for efficiently absorbing electromagnetic waves in a broadband mode, which is disclosed in claim 1, is characterized in that in S4, gr/FeOOH@MoS 2 accounts for 25-35% of the mass percentage of the paraffin mixture.
  9. 9. The method for preparing the functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in a broadband mode, according to claim 1, wherein in the step S4, a paraffin mixture is poured into a preheated die.

Description

Preparation method of functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in broadband Technical Field The invention belongs to the technical field of electromagnetic wave absorption, relates to a preparation method of a wave absorbing material, and particularly relates to a preparation method of a functionalized graphene-based composite wave absorbing material capable of efficiently absorbing electromagnetic waves in a broadband mode. Background With the rapid development of the 5G age, researchers have invested in a great deal of research in solving the serious electromagnetic pollution problem. An excellent electromagnetic wave absorbing material (EMW) is mainly dependent on excellent impedance matching and various losses of electromagnetic waves. Conventional electromagnetic wave absorbing materials are mainly composed of metal oxides, and although these metal materials can provide excellent magnetic loss, they are also constantly subjected to the impact of technological development. Graphene, which is a two-dimensional conjugated material with a high specific surface area, has an excessively high dielectric constant when being used as an electromagnetic wave absorbing material due to a unique six-membered ring structure, ultrahigh conductivity and electron mobility, and is difficult to perform effective impedance matching, so that the absorbing effect is not ideal. Accordingly, various dielectric and magnetic materials are introduced to the graphene surface to lower the dielectric constant, thereby enhancing the electromagnetic wave absorption performance of the material. Ferrite is mainly used as an effective substance of magnetic loss in the wave-absorbing material, but the characteristic of light weight of the wave-absorbing material is not satisfied gradually because of the larger density. Molybdenum disulfide, which is a representative dielectric material, has a multi-layer structure similar to graphene and an indirect band gap of 1.2eV, and is often used as a 2D material similar to graphene. In addition, the MoS 2/graphene composite material has three-dimensional architecture nanoplatelets, which can prevent graphene of adjacent layers from being re-stacked, providing advantageous performance. Therefore, the preparation of the microwave absorbing material lays a foundation for preparing the microwave absorbing material with diversified and cooperative loss mechanisms. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a preparation method of a functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in a broadband. In order to achieve the aim of the invention, the invention adopts the following technical scheme: A functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in a broadband mode is prepared by taking graphene (Gr) prepared by an electrochemical stripping method as a conductive matrix and performing functionalization treatment on the graphene (Gr). The Gr/FeOOH intermediate is prepared by loading needle-shaped ferrite (FeOOH) on the surface of the intermediate by a solution method, and then a layer of flower-shaped molybdenum disulfide (MoS 2) is wrapped on the surface of the intermediate by a one-step hydrothermal method, so that the functionalized graphene-based composite wave absorbing material (Gr/FeOOH@MoS 2) capable of absorbing electromagnetic waves in a broadband and efficient manner is finally prepared. A preparation method of a functionalized graphene-based composite wave-absorbing material capable of efficiently absorbing electromagnetic waves in a broadband mode is divided into the following four steps: S1, dropwise adding a NaAc aqueous solution into a ferrous salt aqueous solution according to a set rate to obtain a mixed solution, heating to a reaction temperature under the conditions of water bath and mechanical stirring for reaction, and sequentially carrying out suction filtration, washing and drying to obtain alpha-FeOOH; s2, carrying out ultrasonic dispersion on graphene Gr and alpha-FeOOH in a reaction medium, carrying out reaction under the conditions of water bath heating and stirring, and then washing and drying a reaction product to obtain Gr/FeOOH; S3, after being dispersed in distilled water in an ultrasonic manner, gr/FeOOH and Na 2MoO4·2H2O、(NH2)2 CS are transferred into a hydrothermal kettle, a rotary hydrothermal reaction is carried out under the constant temperature condition, and after the reaction is finished, products naturally cooled to room temperature are sequentially centrifugally washed and dried to obtain Gr/FeOOH@MoS 2; S4, adding Gr/FeOOH@MoS 2 into melted paraffin, stirring until Gr/FeOOH@MoS 2 is uniformly dispersed to obtain a paraffin mixture, pouring into a mold, and pressing to obtain a paraffin magn