Introducing Wave-Transparent Material Sio2 as an Intermediate Shell to Optimize the Microwave Absorption Performance of Porous Carbon Composite Mnfe2o4 Ferrites

Abstract

Core-shell MnFe2O4@SiO2 precursor was prepared by Stöber method, and then composited with ZIF-8 material. After carbonization process, the MnFe2O4@SiO2@C composite was achieved. The presence of wave-transparent material SiO2 not only stabilizes the MnFe2O4 ferrites core, but also enables effective formation of porous carbon shell. The minimum reflection loss (RLmin) of MnFe2O4@SiO2@C composite reaches -46.96 dB at the frequency f = 15.62 GHz, which corresponds to coating thickness d = 1.682 mm. The double shell structure can effectively enhance the interfacial polarization as well as the synergistic effect of the material dielectric loss. Our work provides significant research ideas for the composite of ferrites and carbon materials.

Keywords: Absorbing materials, Wave-transparent material SiO2, MnFe2O4 ferrites, ZIF-8