Egg derived porous carbon decorated with Fe3O4 nanorods for high efficiency electromagnetic wave absorption

Abstract

In this work, EDC@Fe₃O₄ nanocomposite wave-absorbing materials were obtained by using egg as a precursor and SiO₂ templates to prepare porous structures of egg-derived carbon, followed by a simple reflow calcination process. The microwave absorption properties show that the magnetic content enhances the magnetic loss of the composite material, while the abundant defects and voids on the surface of the egg-derived porous carbon form a network that extends the transmission path of the electromagnetic wave. The synergistic effect of Fe₃O₄ and the porous carbon optimizes the impedance matching of the material and improves its attenuation ability. As a result, the EDC@Fe₃O₄ nanocomposites exhibit excellent microwave absorption properties. The best sample at 9.12 GHz with the strongest reflection loss (RL_min) of −54.19 dB at a matched thickness of 2.46 mm, and the best effective absorption bandwidth (EAB) value of 5.68 GHz at a matched thickness of 2.03 mm. In this study, a biomass-based porous carbon nanocomposite with lightweight, thin thickness, wide bandwidth, and high absorption capacity is designed and prepared by novel strategies, and EDC@Fe₃O₄ nanocomposites are shown to have excellent microwave absorptive properties. magnetic composites with light weight, thin thickness, wide bandwidth and strong absorption ability, and elucidated the synergistic electromagnetic loss mechanism of EDC@Fe₃O₄ nanocomposites.