碳纳米管/空心FeCo异质复合材料构筑及界面协同增强的低频吸波特性OA

The broadening of radar detection bands increases the demand for vehicle stealth.According to the quarter-wavelength theory,low-frequency absorbers require much greater thickness than those of centimeter or millimeter waves.Current microwave-absorbing materials struggle to meet low-frequency absorption needs.To address this issue,this paper constructed a carbon nanotube/hollow FeCo composite heterostructure with strong low-frequency microwave absorption.This paper used ammonium fluoride as a morphology modifier to induce a uniform hollow structure in the FeCo alloy.The composite leveraged the high dielectric loss of carbon nanotubes and the high magnetic loss of hollow FeCo through interfacial coupling.The samples achieved a maximum reflection loss of-65.64 dB at 4.8 GHz,and an effective absorption bandwidth(RL≤-10 dB)of 7.33 GHz,which surpass the conventional absorbers.This paper offers a new strategy for the structural design and preparation of low-frequency broad and microwave absorbers,with promising applications in stealth and electromagnetic shielding field.