Enhanced Tunability of Broadband Microwave Absorption for MoSe2/FeSe2 Nanocomposites with a Unique Heterostructure

Heterostructure engineering is employed as an ingenious approach to endue materials with desired functions. Transition-metal dichalcogenides exhibit outstanding microwave absorption performance owing to diversified structures and unique electronic properties. Herein, we construct MoSe2/FeSe2 nanocomposites with the unique heterostructure where the 2D ultrathin MoSe2 forest grows based on FeSe2 nanorods, showing a minimum reflection loss (RLmin) of −52.26 dB at 13.92 GHz corresponding to the thickness of 1.71 mm with an effective absorption bandwidth of 4.06 GHz. Furthermore, the RLmin of the flower-like MoSe2 can attain −59.73 dB with an effective absorption bandwidth of 1.83 GHz (4.05–5.88 GHz), and variation in composition reflects the development potential of low-frequency absorption. Multiple attenuation mechanisms involving multiple scattering, conduction loss, and interfacial/dipolar polarization loss may be conducive to the enhanced absorption properties. This work establishes a feasible path to design heterostructures with tunable microwave absorption properties for the various application areas.