Development of sulfide-doped Graphene/Fe3O4 absorber with wide band electromagnetic absorption performance

Graphene has been confirmed as an ideal lightweight and high-performance electromagnetic (EM) absorber if used to deal with increasingly electromagnetic interference issue. However, the actual EM absorption performance of graphene is not desirable in a thin thickness which is due to poor impedance matching behavior and single conductive loss form. To overcome this difficulty, this research employed S doping and magnetic Fe3O4 nanoparticles loading strategies to boost EM attenuation ability by introduction of various EM loss forms, e.g. dipolar, interface, and magnetic loss ability etc. Besides, the impedance matching ability of SGN/Fe3O4 has significant improved as compared to pure graphene, primarily owing to the sharply decrease of relative complex permittivity (εr) values. The as-prepared S-doped graphene/Fe3O4 (denote as SGN/Fe3O4) absorber shows excellent wideband electromagnetic absorption property at a thin thickness of 2.0 mm which the frequency width with a reflection loss < -10 dB reach 5.3 GHz.