Synergistic regulation of dielectric-magnetic dual-loss and triple heterointerface polarization via magnetic MXene for high-performance electromagnetic wave absorption

Abstract

• NiCo/CeO 2 /Ti 3 C 2 T x composites with multilayer structure were prepared. • The effective bandwidth of the composite is up to 6.32 GHz at 1.9 mm. • The modulation of electromagnetic parameters was achieved by controlling the amount of Ce 3+ introduced. • The mechanism of wave absorption of composite materials is explored and explained in depth. The single dielectric/magnetic loss mechanism and invalid polarization loss are the crucial issues which limit the exploitation of multi-component electromagnetic wave (EMW) absorption materials, especially Ti 3 C 2 T x MXene based absorption materials. In this work, a series of loosely packed accordion-like 3D NiCo/CeO 2 /Ti 3 C 2 T x with tunable and high-efficient EMW absorption were fabricated by introducing self-assembled NiCo alloys on the surface of Ti 3 C 2 T x and subsequent anchoring of CeO 2 . On the one hand, the magnetic NiCo particles and highly conductive Ti 3 C 2 T x achieved the dielectric-magnetic dual-loss. On the other hand, the triple interfacial polarization among NiCo/CeO 2 /Ti 3 C 2 T x further enhanced the relaxation loss. In addition, the effects of cerium ions on tuning the compositional structure, electromagnetic parameters and impedance behavior of the composites are explored. The NiCo/CeO 2 /Ti 3 C 2 T x -0.1 performed a wide absorption bandwidth of 6.32 GHz at 1.9 mm, as well as, the minimum reflection loss value of -42.48 dB at 2.0 mm. This work putted forward a new synergistic regulation strategy of dielectric-magnetic dual-loss and triple heterointerface polarization via magnetic MXene for high-performance EMW absorption, which may shed new light on the fabrication of multiple-component synergistic loss absorption materials.