Fabricating FeS2 and CuFeS2 microspheres embedded into biomass derived porous carbon with excellent microwave absorption

The design of carbon magnetic matrix nanocomposites with synergistic dielectric and magnetic losses is a significant research hotspot issue of wave-absorbing materials. In this paper, FeS2-CuFeS2@RPC composites were firstly fabricated by doping FeS2 on copper sulfide/rice husk derived porous carbon (Cu7.2S4@RPC), by controlling the amount of iron and sulfur sources. The study results indicate that the FeS2-CuFeS2@RPC-3 shows outstanding electromagnetic wave absorption performance. The minimum reflection loss (RLmin) of sample reaches -42.30 dB at 15.11 GHz (Ku band), corresponding to matching thickness of 1.7 mm, and the maximum effective absorption band (EAB) is 5.78 GHz at 1.9 mm. The synergistic interaction of the magnetic and dielectric components, which improves impedance matching, is responsible for this outstanding performance. The research of metal sulfide absorbing composite material scientific provide a new train of thought, and promote the development and application of metal sulfide composite absorbing materials.