Dual-regulation of magnetization and multi-interfacial strategies in MXene/CoNiM-800 (M = Fe/Cu/Mn/Zn) hierarchical structures for synergistic microwave absorption

Abstract

MXene is widely regarded as a potential electromagnetic wave absorption (EMA) material due to its good electrical conductivity properties and multilayer structure. However, this characteristic typically results in suboptimal impedance matching conditions. Introducing magnetic components can effectively optimize its impedance matching performance. Multi-interfaces can significantly enhance interfacial polarization and thus the dielectric loss of the composites. Herein, starting from the dielectric–magnetic synergy and multi-interfacial strategy, architecture-inspired layered double hydroxide (LDH) nanosheets are successfully grown in situ on the surface and interlayer of MXene. Furthermore, based on the CoNi-LDH nanosheet, an adjacent third element (Fe/Cu/Mn/Zn) is introduced into the magnetic CoNi alloy to modulate the magnetic responsiveness and interfacial components. The dielectric–magnetic synergy and multiple interfaces combine to promote excellent EMA performance with a minimum reflection loss (RL_min) of −57.63 dB at 1.44 mm.