Abstract
? 2022 Elsevier B.V.In this work, a rare system of Sr3Co2Fe24O41/MoS2 composites has been successfully prepared via the sol-gel method and following a facile hydrothermal process, from which the flower-like MoS2 was evenly anchored on the surface of Z-type Sr3Co2Fe24O41 microplatelets. It is confirmed that the effective combination of transition metal sulfide MoS2 and multiferroic Sr3Co2Fe24O41 hexaferrite greatly optimizes the dielectric behaviors of the composites. Meanwhile, the unique hierarchical structure further enhances the microwave absorption properties. When the mass ratio of Sr3Co2Fe24O41 to MoS2 is 1:3 in composites, the smallest reflection loss value is ? 39.2 dB at the thickness of 2.0 mm, and note that the adequate absorption bandwidth can reach up to 7.6 GHz (10–17.6 GHz) with 2.2 mm. When the mass ratio is adjusted as 1:5, the optimal reflection loss of the composite reaches ? 44.5 dB at 9.28 GHz with a thickness of 3.0 mm. The high-efficiency microwave absorption performance of the composites is attributed to the synergistic effect of dielectric materials and multiferroic materials. The calculation results on delta and attenuation constant display that impedance matching degree and attenuation ability of composites are balanced, which not only reduces the reflection of electromagnetic waves on the absorber surface, but also enhances its consumption. At the same time, the flower-shaped MoS2 is stacked on the surface of Sr3Co2Fe24O41 microplatelets which is conductive to the multiple reflections and scattering of electromagnetic waves between layers, greatly promoting the attenuation of electromagnetic waves. This work opens up an updated pathway for the design of magnetic/dielectric microwave absorbers with vigorous absorption and ultra-wideband.
NSTL
Elsevier