Abstract
With the development of intelligent communications and stealth technology in the military field, electromagnetic wave pollution cannot be ignored, and absorbing materials have entered people’s field of vision and gradually become a research hotspot. The ideal absorbing material should have the characteristics of “strong, wide, thin, and light”, but a single absorbing material often cannot meet the above conditions. At present, absorbing metal powder combined with two-dimensional carbon nanomaterials (such as carbon nanotubes, graphene, etc.) has became a trend. This article focus on a three-layer composite of Fe3O4, Carbon nanotubes@ Fe3O4, Carbon nanotubes@Graphene nano-platelets@ Fe3O4, which was synthesized by solvothermal method. The results show that the electromagnetic wave absorption performance of the three-layer foam at a thickness of 3.0 mm is more excellent. The minimum of RL can reach −67.0 dB, and the effective bandwidth is above 5.0 GHz. All this is due to the synergy of dielectric and magnetic loss between Fe3O4, CNTs, and GN, the increase of interface polarization and the path of electromagnetic wave reflection and scattering by three-layer foam.
Highlights
With the widespread use of radio technology, electromagnetic wave radiation has caused serious environmental pollution and endangered human health [1,2,3,4,5].In order to eliminate electromagnetic wave pollution, people have continually been developing new and efficient electromagnetic wave absorbing materials (EMWA)
Carbon nanotubes have a diameter of 9 nanometers and a length of about 1.5 um, indicating that the composite nanoparticles of CNTs@Fe3 O4 have been successfully prepared, and it is expected that the nano-scale particles of this composite structure will exceed the Snoek limit [24]
Fe3O4/CNTs@Fe3O4/CNTs@GN@Fe3O4 magnetic nanoparticles were prepared by a simple solvothermal method and dispersed in one-component moisture self-foaming polyurethane
Summary
With the widespread use of radio technology, electromagnetic wave radiation has caused serious environmental pollution and endangered human health [1,2,3,4,5]. In order to further improve the performance of EMWA materials, a new type of wave absorbing agent has been prepared by compounding carbon materials and Fe3 O4 through many methods. He et al [15] coated the surface of hollow fly ash microspheres (HFAM) with a nano-Fe3 O4 layer to form a HFAM/Fe3 O4 absorbent. The cement-based material functionalized with HFAM/Fe3 O4 shows excellent Electromagnetic wave absorption performance, and its bandwidth is close to 8 GHz when the bandwidth is lower than −10 dB, which indicate that this new HFAM/Fe3 O4 absorbent modified cementbased material has potential. The three powder particles are dispersed in a single-component moisture-curable polyurethane, and a three-layer magnetic foam is prepared by the layer-by-layer method to achieve the purpose of enhancing absorption and broadening the frequency band
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