Structural engineering of double shells decoration for preparing a high-efficiency electromagnetic wave absorber

Abstract

As 5G technology advances, so does the prevalence of harmful electromagnetic waves, and as a result, researchers have been progressively interested in developing materials that can absorb microwaves. So, it's become desirable to fabricate unique microwave absorbent materials (MAMs) to mitigate the negative effects of electromagnetic radiation and offer protection to biological beings and electronic data. Herein, we fabricated a novel HoFeO3@WSe2@SiO2 composite via the co-precipitation method. The microwave absorption properties of the HoFeO3,WSe2, SiO2 and HoFeO3@WSe2@SiO2 (with 25, 35 and 45 wt% loading) were examined in the X-band frequency range. 35 wt% filler loading shows reasonable reflection loss values with the broadest effective absorption bandwidth (EAB). The optimum impedance matching is responsible for the enhanced microwave absorption performance of the HoFeO3@WSe2@SiO2 with 35 wt% filler loading. In addition, the best sample is measured using both waveguide and free-space techniques and the results have been compared. The free-space method has been demonstrated to be an effective alternative testing strategy due to its contact-free and non-destructive features. Furthermore, the technique described in this study to design innovative HoFeO3@WSe2@SiO2 microwave absorbers can offer significant assistance with a wider absorption band. In this context, HoFeO3@WSe2@SiO2 is expected to be used as a highly efficient microwave absorbent.