Triple-layer structure of carbon foam coated with carbon nanotubes and FeNi alloy for high-performance electromagnetic wave absorption
Résumé
In this paper, a three-dimensional carbonized melamine foam (CMF) with double coatings has been synthesized to improve the microwave absorption: 1) growing carbon nanotubes (CNTs) on CMF; 2) coating FeNi alloy and then growing CNTs on CMF. By changing the reaction conditions, the length, the growth density of CNTs, and the morphology of FeNi can be controlled in the hybrids. The results show that the single-layer absorber with a thickness of 2.5 mm demonstrates an ultrawide effective absorption bandwidth (EAB, RL ≤-10 dB) of 6.2 GHz (from 9.8 to 16 GHz). Moreover, an optimized triple-layer absorber is proposed based on the different electromagnetic properties of hybrids obtained in this work. By simulation, a triple-layer absorber with the best reflection loss of-64 dB and an EAB of 7.4 GHz could be obtained. By further modulating the thickness of each layer in the model, the EAB can be extended to 14.7 GHz (3.3 ~18 GHz), which would be highly competitive for electromagnetic absorption applications.
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