Excellent electromagnetic wave absorbing properties of two-dimensional carbon-based nanocomposite supported by transition metal carbides Fe3C

A two-dimensional carbon-based composite material loaded with magnetic nanoparticles Fe3C (CN-Fe3C) was successfully designed and prepared to ensure the dielectric loss and magnetic loss effect occur simultaneously. The impedance matching of the material is better realized, and the absorbing performance is improved. The loading of ferromagnetic Fe3C effectively improves the magnetic properties of the composites. When the filling amount is only 10 wt%, the composite can achieve a reflection loss value of -46.78 dB at 13.53 GHz, and the effective absorption bandwidth is as high as 5.01 GHz. The excellent absorbing performance is mainly due to the enhancement of interfacial polarization and the synergistic effect between the dielectric properties of carbon materials and the magnetic properties of Fe3C. CN-Fe3C/PVDF also shows good electromagnetic shielding effectiveness. This work has developed new ideas for designing and preparing "thin", "light", "wide", and "strong" two-dimensional carbon-based composite absorbing materials. (C) 2020 Elsevier Ltd. All rights reserved.