Fabrication of RGO-based aerogel decorated with Core-shelled Ag@Fe3O4 nanospheres for High-performance electromagnetic wave absorption

Abstract

The limitations of single dielectric-loss materials have driven extensive research into designing electromagnetic wave (EMW) absorbers that achieve a balance between dielectric and magnetic losses. In this study, a lightweight, porous Ag@Fe₃O₄ modulated Reduced graphene oxide (RGO) aerogel was synthesized via a simple hydrothermal method to address this challenge. It can be seen that the Ag@Fe₃O₄-RGO composite demonstrates superior EMW absorption compared to pure RGO, achieving a minimum reflection loss (RL) of −50.6 dB at 8.64 GHz with an effective absorption bandwidth (EAB) of 7.5 GHz. The enhanced absorption performance is attributed to synergistic effects between impedance matching, interfacial polarization, and optimized attenuation constants. These results indicate that Ag@Fe₃O₄-RGO aerogel is expected to be a candidate material for EMW absorption.