Multilayer-structured MXene/Fe₃O₄ nanosheets composites for electromagnetic interference shielding with low reflection

The development of high-performance electromagnetic interference (EMI) shielding materials that minimize reflection is of paramount importance in the electronics industry. This study introduces a novel approach to fabricating multilayered composite films consisting of MXene and Fe₃O₄ nanosheets (FONS), which exhibit significantly enhanced EMI shielding effectiveness (SE) with reduced reflection characteristics. By leveraging the synergistic properties of highly conductive MXene and the magnetic properties of FONS, the composite films demonstrate a maximum SE of 34.3 dB within the X-band with a mere 0.17 mm thickness and a low filler content of 6.25 wt.%. The FONS contribute to an increased total EMI SE while concurrently suppressing the reflection SE, achieving a minimum reflection of only 4.2 dB. The alternating multilayered structure, characterized by dense distribution of MXene and the impedance matching capabilities of FONS/waterborne polyurethane layers, results in a pronounced interfacial polarization effect, which enhances the polarization loss.