Improved magnetic loss and impedance matching of the FeNi-decorated Ti3C2Tx MXene composite toward the broadband microwave absorption performance

Abstract

MXene-based magnetic–dielectric composites with synergetic magnetic and dielectric losses have exhibited great potential in the practical applications of microwave absorbing material. In the present paper, novel composites consisting of laminated Ti3C2Tx MXene decorated with magnetic FeNi nanoparticles were constructed via a facile in situ hydrothermal approach. The microstructure, morphology, magnetic properties, and microwave absorption performances of as-synthesized samples were investigated in detail, and corresponding mechanisms were further discussed. Results demonstrated that the frequency dependence of electromagnetic parameters for the FeNi/Ti3C2Tx MXene composites could be easily regulated by simply changing the content of FeNi nanoparticles in favor of improved magnetic loss and optimized impedance matching. Consequently, a broadband effective absorption bandwidth (RL < − 10 dB) of 6.2 GHz with a thin matched thickness of 1.6 mm was achieved for the FeNi/Ti3C2Tx MXene composites with 20 wt% FeNi loading, which could be identified as high-efficiency microwave absorbing material.