Construction of multi-interfacial carbon-based bimetallic selenides composites for high-efficiency microwave absorption

With the increase in electromagnetic wave pollution, the development of high-performance microwave absorbers has become a critical research focus. Multi-interface dielectric loss microwave absorbers have emerged as a promising strategy to address electromagnetic pollution. In this study, multi-interface carbon-based selenide composites were synthesized via solvothermal treatment and pyrolytic selenization. The thermal treatment temperature significantly influences the crystal phase, defects, and the electromagnetic properties. The results demonstrate that the carbon-based selenide composite exhibits excellent microwave absorption. The maximum reflection loss reaches −52.37 dB at a thickness of 2.9 mm, while the effective absorption bandwidth is 4.43 GHz at a thickness of 1.75 mm. The designed periodic unit cell metamaterial structure, based on MMSC composites, achieves an effective absorption bandwidth of 11 GHz at a thickness of 6.0 mm. This study proposes a novel strategy for synthesizing multi-interface carbon-based bimetallic selenide composites as high-performance microwave absorbers.