Carbon fibers@Co-ZIFs derivations composites as highly efficient electromagnetic wave absorbers.

Ø Carbon fibers@Co-ZIFs derivations composites were prepared by facile electrospinning process and oxidation method. Ø Modulating permittivity is achieved by adjusting the oxidation process. Ø The effective bandwidth covers 9–18 GHz when the coating thickness ranges from 1.3 mm to 2.1 mm. Ø The optimized sample delivers a maximum reflection loss (RL) value of −32.7 dB with a bandwidth of 4.4 GHz at 1.7 mm. Ø The material coatings with composites contribute to the RCS values which are less than −10 dB m² at the range of −90° <theta<−10° and 10° <theta<90°. To reduce electromagnetic (EM) wave interference pollution, in this work, carbon fibers@Co-ZIFs derivations (CFZD) as an advanced EM wave absorbing material was successfully prepared. The yolk-shell structure of the magnetic metal particles generated a large amount of contact area, facilitating the interface polarization and relaxation. As a result, the optimized sample delivers a maximum reflection loss (RL) value of -19.2 dB with a bandwidth of 2.6 GHz at a small thickness of 1.3 mm. Additionally, ANSYS Electronics Desktop 2018 (HFSS) was used to simulate the radar cross section (RCS) reduction in practical application based on these composites. The RCS values of composite coatings are less than -10 dB m² at the range of -90° <theta<-10° and 10° <theta<90°, which indicate the effective reduction of the radar reflection signal by the composite coatings. The work is of reference significance for preparing great absorbing materials and designing absorbing coatings by combining simulation method. [Display omitted] [ABSTRACT FROM AUTHOR]