Double shell structured MnFe2O4 @FeO/C derived from MnFe2O4 @ZIF-8 for electromagnetic wave absorption

The composites formed by the coupling of ferrite and Metal-Organic Framework derivatives have attracted wide attention based on the outstanding microwaves absorption properties. In this paper, MnFe2O4 @ZIF-8 was used as the precursor and was carbonized at 700 degrees C under Ar atmosphere to obtain MnFe2O4 @FeO/C double shell structure. The carbon-coated composite structure is beneficial to enhance the interfacial polarization on the surface of powder particles and enhance the absorbing properties of the material sig-nificantly. Among others, the carbon content is controlled by adjusting the content of coated ZIF-8. The double shell nanoparticle shows excellent reflection loss value of - 53.75 dB at 11.6 GHz with a matching thickness of 1.8 mm, and the corresponding effective absorption bandwidth is 4.74 GHz from 10.27 to 13.90 GHz and 16.89-18.0 GHz.(c) 2022 Elsevier B.V. All rights reserved.