The Effect of rGO on the Electromagnetic Interference Shielding Performance of Epoxy Composites Incorporating MXene/rGO Fillers

The 3D structure of carbon materials enhances electromagnetic (EM) wave shielding performance, while the 3D interconnective network improves porosity to create various interfaces for effective impedance matching for broadband microwave absorption and electromagnetic interference (EMI) shielding. This hierarchical structure feature, with its large specific surface area and abundant interfaces, can promote EM energy absorption, thereby enhancing EM shielding performance. The powder-, unidirectional-, and foam-type fillers were prepared by mixing MXene and rGO, and these fillers were impregnated into epoxy to produce composites, evaluating the EM wave shielding performance of the epoxy composites. The EMI shielding effectiveness (EMI SE) value of epoxy composites containing 15 wt% foam-type filler exhibited over 90 dB at 18 GHz, and the addition of rGO to MXene showed an increasing effect on the EMI SE of the epoxy composite across a broadband. The foam-type MXene/rGO filler demonstrated excellent EMI SE values, making it a valuable material for polymer composites for EM wave shielding purposes.