Abstract
Among many electromagnetic absorbing materials, carbon matrix composites are regarded as an ideal electromagnetic absorbing agent because of their advantages of low density, low cost and strong electromagnetic loss. It is generally believed that the properties of the electromagnetic absorbent are closely related to its composition and microstructure, but the understanding of the relevant mechanism needs to be further improved. Therefore, this paper studies a new ternary composite material HCNTs/Fe@Fe3O4, which is made of acidified carbon nanotubes (HCNTs) modified by magnetic core shell Fe@Fe3O4 nanoparticles. The material has a variety of interface polarization and dipole loss forms, showing a good electromagnetic absorption capacity and impedance matching performance. The absorption band width of the electromagnetic absorber can reach 5.5 GHz at the thickness of 1.5 mm. The C o values of HCNTs/Fe-@Fe3O4 and HCNTs/Fe-@Fe2O3 samples with strong antioxidant capacity fluctuated with the change of frequency, indicating that the eddy current loss had a weak magnetic loss on the samples. Thus, it can be inferred that the changed C o value also indirectly proves that the magnetic loss of the sample may come from natural resonance.
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