Novel approach to prepare carbon-encapsulated CIPs@FeO composite for efficient absorption of low-frequency microwave

Due to the urgently demand of microwave absorption materials in the low-frequency band, herein the CIPs@FeO@C multilayer core–shell composite with advisable low-frequency microwave absorption performance has been successfully synthesized by a novel co-calcine, high temperature thermal diffusion and reduction method. The excellent attenuation characteristic, good impedance matching property, efficient eddy current loss, Debye relaxation and interfacial polarization etc. contribute to this desirable low-frequency electromagnetic absorption performance. The broadest effective absorption bandwidth in low-frequency range is 1.2 GHz and the maximum RL is − 24.64 dB at 1.88 GHz for 4 mm and 6 mm, respectively. The as-prepared ternary composite has a great potential in production of low-frequency microwave absorption materials for the delightful performance and economical preparation method.