Magnetic enhanced high-efficiency electromagnetic wave absorbing MXene/Fe3O4 composite absorbers at 2–40 GHz.

Electromagnetic wave (EMW) absorbing materials are widely used in the communication, aerospace, electronics, and military industries. In this work, MXene composites decorated with Fe₃O₄ nanoparticles on the surface (MF) have been prepared by a one-step method to improve the electromagnetic attenuation performance in the microwave and millimeter-wave frequency bands between 2 and 40 GHz. The interlayers of MXene are distributed with Fe₃O₄ nanoparticles with a size of 20–30 nm, forming a sandwich-like microstructure. The conductive network and the polarizing group have been adjusted by introducing magnetic metal oxides into the accordion-like MXene matrix and the molar ratio of MXene and Fe₃O₄. The minimum reflection loss (RL_min) can be up to −66.25 dB, and the maximum effective absorption bandwidth (EAB) can be up to 8.49 GHz by adjusting the thickness of the absorber. The synergistic effects and structural advantages of Fe₃O₄ (magnetic loss) and MXene (dielectric loss), as well as the multiple reflections because of the sandwich-like structure, make MXene/Fe₃O₄ composites show superior EMW absorption performance in microwave and millimeter wave frequency bands. We anticipate that this work may enrich the survey of MXene/metal oxide absorbers. [ABSTRACT FROM AUTHOR]