Fabrication of core-shell NiFe2O4@C@PPy composite microspheres with efficient microwave absorption properties

To further improve that microwave absorption performance, in this work, a core–shell NiFe2O4@C@PPy composite microspheres was prepared via Sol-gel method and interfacial polymerization. The results of characterization analysis and wave absorption test show that the core–shell structure nano-absorbing material possesses good microwave absorption performance. A minimum reflection loss of −38.69 dB and an effective absorption bandwidth of 5.5 GHz (11.75–17.25 GHz) are obtained at a thin matching thickness of 1.75 mm.