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CN-122002774-A - MoS-based2Anti-electromagnetic interference design method of/C composite dielectric wave absorber

CN122002774ACN 122002774 ACN122002774 ACN 122002774ACN-122002774-A

Abstract

The invention relates to an anti-electromagnetic interference design method based on MoS 2 /C composite dielectric wave absorber, and belongs to the technical field of electromagnetic compatibility and wave absorbing materials. According to the method, the MoS 2 /C composite dielectric wave absorber is directly prepared by mixing a molybdenum source, a sulfur source and a carbon source in one step and calcining at a high temperature. The process simplifies the traditional multi-step synthesis flow and realizes the close contact between components. The prepared wave absorber has a porous and nano-sheet crosslinked structure, and has good impedance matching and high dielectric loss characteristics. The high-efficiency absorption of electromagnetic waves can be realized by dispersing the high-efficiency absorption agent in a polymer matrix and coating the high-efficiency absorption agent on the target surface. The pure dielectric composite material avoids the stability problem of magnetic components, can realize strong absorption of-52.8 dB and wide effective bandwidth of 6.5 GHz, and has important application value in the fields of electronic protection, stealth and the like.

Inventors

  • JIANG BO
  • ZHANG CHAO
  • ZHUANG YAMING
  • LI QINGGUO
  • YAN PAN
  • ZHAO YUAN
  • LIN SIYI
  • LUO MING
  • Yuan Mengchao

Assignees

  • 西南技术物理研究所

Dates

Publication Date
20260508
Application Date
20251225

Claims (10)

  1. 1. An anti-electromagnetic interference design method based on MoS 2 /C composite dielectric wave absorber is characterized by comprising the following steps: Step S1, uniformly mixing a molybdenum source, a sulfur source and a carbon source to obtain a uniform mixture; S2, carrying out high-temperature calcination treatment on the uniform mixture in an inert atmosphere, and obtaining the MoS 2 /C composite dielectric wave absorber after the reaction is completed; And step S3, dispersing the MoS 2 /C composite dielectric wave absorber in a polymer matrix to form a wave absorbing composite material, and coating or forming the wave absorbing composite material on the surface of the device to be protected.
  2. 2. The design method according to claim 1, wherein in the step S1, the molybdenum source is at least one selected from molybdenum trioxide, ammonium molybdate, sodium molybdate, lithium molybdate, molybdenum trichloride, and molybdenum pentachloride.
  3. 3. The method according to claim 2, wherein the sulfur source is at least one selected from the group consisting of sulfur powder, sublimed sulfur, thiourea, thioacetamide, sodium thiosulfate and hydrogen sulfide, and the carbon source is at least one selected from the group consisting of graphite-phase carbon nitride, urea, dicyandiamide, melamine, glucose, citric acid, polyacrylonitrile and a phenolic resin.
  4. 4. The design method according to claim 1, wherein in the step S2, the high-temperature calcination treatment is performed at a temperature of 700 ℃ to 1000 ℃ for a calcination time of 1 to 3 hours.
  5. 5. The method according to claim 1 or 4, wherein the inert atmosphere is an argon or nitrogen atmosphere.
  6. 6. The method according to claim 1, wherein in the step S3, the polymer matrix is at least one selected from thermoplastic polyurethane, thermosetting polyurethane, epoxy resin, polytetrafluoroethylene, polyvinylidene fluoride, rubber, paraffin, and polyimide.
  7. 7. The method according to claim 1, wherein the step S3 of dispersing the wave absorber in the polymer matrix is performed by uniformly mixing the MoS 2 /C composite dielectric wave absorber with the polymer in a molten or dissolved state, and the coating or forming method comprises doctor blade coating, dipping, spin coating, screen printing, roll coating, spray coating or 3D printing.
  8. 8. The design method according to any one of claims 1 to 7, wherein a weight ratio of the molybdenum source, the sulfur source, and the carbon source is (1-2): 2-4): 1-2.
  9. 9. A MoS 2 /C composite dielectric absorber prepared by the process of any one of claims 1 to 7, characterized in that the absorber is a composite material having a porous and/or nanoplatelet cross-linked structure, the composition of which comprises MoS 2 and a carbon material.
  10. 10. The MoS 2 /C composite dielectric absorber of claim 9, wherein the absorber has an absorption intensity of-52.8 dB and an effective absorption bandwidth of 6.5 GHz, and a reflection loss of-10 dB.

Description

Anti-electromagnetic interference design method based on MoS 2/C composite dielectric wave absorber Technical Field The invention belongs to the field of electromagnetic compatibility, and particularly relates to an anti-electromagnetic interference design method based on MoS 2/C composite dielectric wave absorber. Background Along with the rapid development of information technology, electromagnetic waves are increasingly widely applied in human life, and besides bringing convenience to human beings, the electromagnetic waves also cause electromagnetic radiation interference, and harm to human health, safety, signal transmission and the like. At present, electromagnetic pollution has become the fourth pollution after atmospheric pollution, noise pollution and water pollution, and in order to solve the problem of electromagnetic pollution, various circles pay attention to the research and development of electromagnetic shielding and electromagnetic absorption. The electromagnetic shielding achieves the aim of resisting electromagnetic interference by reflecting electromagnetic waves, and secondary pollution is easy to generate, so that the high-performance wave-absorbing material can better meet the practical application requirements of electromagnetic compatibility. MoS 2 is gradually becoming a research hotspot in the wave-absorbing field, however its electromagnetic loss capability is poor. In order to improve the electromagnetic protection function of the dielectric material, the introduction of the magnetic material is an effective strategy, but the magnetic material is easy to react with oxygen, acid and other mediums, and the stability is poor. Another way to increase the absorption capacity of MoS 2 is to introduce a high dielectric loss carbon material, and MoS 2/C pure dielectric composite is expected to achieve excellent electromagnetic interference resistance under the synergistic effect of appropriate impedance matching of MoS 2 and high dielectric loss of carbon. At present, the method for preparing MoS 2/C generally comprises pyrolysis and hydrothermal treatment, and is complex in steps and high in energy consumption, and the process is difficult to directly realize production and use. From the analysis, it can be seen that the research on a simple method for preparing the high-performance MoS 2/C composite dielectric wave absorber is an urgent need in the field of electromagnetic compatibility, so that the purpose of high-efficiency electromagnetic interference resistance is achieved. Disclosure of Invention The invention provides an anti-electromagnetic interference design method based on MoS 2/C composite dielectric wave absorber, which aims to solve the technical problems that: In order to solve the technical problems, the invention provides the following components. An anti-electromagnetic interference design method based on MoS 2/C composite dielectric wave absorber is characterized by comprising the following steps: Step S1, uniformly mixing a molybdenum source, a sulfur source and a carbon source to obtain a uniform mixture; S2, carrying out high-temperature calcination treatment on the uniform mixture in an inert atmosphere, and obtaining the MoS 2/C composite dielectric wave absorber after the reaction is completed; And step S3, dispersing the MoS 2/C composite dielectric wave absorber in a polymer matrix to form a wave absorbing composite material, and coating or forming the wave absorbing composite material on the surface of the device to be protected. In the step S1, the molybdenum source is at least one selected from molybdenum trioxide, ammonium molybdate, sodium molybdate, lithium molybdate, molybdenum trichloride and molybdenum pentachloride. The sulfur source is selected from at least one of sulfur powder, sublimed sulfur, thiourea, thioacetamide, sodium thiosulfate or hydrogen sulfide, and the carbon source is selected from at least one of graphite-phase carbon nitride, urea, dicyandiamide, melamine, glucose, citric acid, polyacrylonitrile or phenolic resin. In the step S2, the high-temperature calcination treatment is performed at a temperature of 700 ℃ to 1000 ℃ for a calcination time of 1 to 3 hours. The inert atmosphere is argon or nitrogen. In the step S3, the polymer matrix is at least one selected from thermoplastic polyurethane, thermosetting polyurethane, epoxy resin, polytetrafluoroethylene, polyvinylidene fluoride, rubber, paraffin or polyimide. In the step S3, the mode of dispersing the wave absorbing agent in the polymer matrix is that MoS 2/C composite dielectric wave absorbing agent is uniformly mixed with the polymer in a molten or dissolved state, and the mode of coating or forming comprises blade coating, dipping, spin coating, screen printing, roller coating, spraying or 3D printing. The weight ratio of the molybdenum source to the sulfur source to the carbon source is (1-2): 2-4): 1-2. The MoS 2/C composite dielectric wave absorber prepared by the method