Enhancing interface polarization by interface engineering of MoSe2/FeSe to achieve efficient microwave absorption

The synergistic effects of magnetic-dielectric loss and interfacial polarization are commonly employed to enhance the performance of electromagnetic wave absorbers. Layered transition metal selenides are promising candidates for electromagnetic wave attenuation applications, owing to their high attenuation coefficients and the unique morphology resembling layered flowers. MoSe₂/FeSe layers were constructed by hydrothermal reaction of double-layer core-shell FeSiBCuNbZr@SiO₂@TiO₂ amorphous microspheres to improve the performance of the absorber. The construction of the MoSe₂/FeSe shells greatly improves impedance matching and introduces heterogeneous interfaces, which substantially increase the interface polarization loss. Especially for FST@MF-2, it exhibits excellent microwave absorption performance at 4.57 GHz with an RL_min of −62.06 dB. Furthermore, the effective absorption bandwidth (RL<-10 dB) of this material can reach 4.25 GHz with 1.68 mm. Compared with perfect electrical conductor (PEC), the radar cross-section (RCS) reduction value of FST@MF-2 can reach 26.64 dB m² (from 5.22 dB m² to -21.42 dB m²), which helped to reduce the RCS of military equipment. This work presents a meaningful reference for designing electromagnetic wave absorbers, achieved via the integration of amorphous magnetic cores and multicomponent dielectric shells.