Preparation and electromagnetic-wave-absorption properties of a nitrogen-doped carbon-supported iron(II,III) oxide composite

A single material with dielectric or magnetic loss behavior cannot optimally absorb electromagnetic waves because such waves are composed of two interdependent parts, a magnetic field and an electric field. In this study, a composite material, NCS@Fe3O4, was prepared from a nitrogen-doped carbon material, dopamine, and Fe3O4 using pyrolysis. The morphology, structure, chemical composition, electromagnetic parameters, and electromagnetic wave absorption properties of the composite material were analyzed using scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and vector network analysis. The results show that NCS@Fe3O4 has a strong electromagnetic wave absorption capacity, with a maximum reflection loss of -48.5 dB at a thickness of 2 mm. The corresponding effective absorption bandwidth is 9.12 GHz. Consequently, NCS@Fe3O4 is an effective material for electromagnetic wave absorption.

Automated summary

In this study, a composite material NCS@Fe3O4 was prepared and its chemical composition, morphology, structure, electromagnetic parameters, and electromagnetic wave absorption properties were analyzed. The results showed that NCS@Fe3O4 exhibited strong electromagnetic wave absorption capacity.