Fe₃O₄/FeS_x hollow heteronanospheres/reduced graphene oxide aeroge for electromagnetic wave absorption

The fabrication of materials featuring hollow structures or multi-component heterostructures effectively enhance the performance of electric/magnetic loss and improve the impedance matching properties of absorbers. In this work, by precisely controlling the sulfidation temperature at 400 degrees C and incorporating rGO, we successfully obtained Fe3O4/FeSx-rGO aerogel materials with exceptional structural integrity and crystallinity. The electromagnetic parameter analysis and calculation confirm the enhancement of impedance matching, interface polarization, electrical conductivity, and dielectric loss capability of the hollow structure and multi-interface heterostructure; while computer simulation technology results verify the effective attenuation capability of the absorber for electromagnetic energy under practical application conditions. As a result, the reflection loss of Fe3O4/FeSx-rGO reach -43.03 dB at a thickness of only 2.0 mm and the effective absorption bandwidths is 4.24 GHz at a thickness of 1.6 mm. This multifactorial synergistic enhancement mechanism provides a new idea for the design and preparation of high-performance electromagnetic wave absorbing materials.