Research on two-dimensional FeSiCr/mesoporous MXene composites and their absorption properties

Abstract

This study constructed FeSiCr/mesoporous MXene composites via electrostatic adsorption, focusing on investigating the regulatory mechanism of MXene pore structure on the material's wave absorption properties. Adjusting the oxidant concentration led to abundant mesoporous voids on the MXene surface, with pores concentrated in the small pore size range, significantly increasing the heterogeneous interfaces and electromagnetic wave transmission pathways within the material. By increasing the mesopore density, the composite's microstructure was optimized, enhancing the interfacial compatibility and the synergistic interaction between the two materials. Combined with FeSiCr, this effectively balanced impedance matching and electromagnetic wave attenuation capabilities. The mesoporous MXene structure obtained by etching with 0.2 mmol L⁻¹ of oxidizing agent exhibited outstanding S-band performance, achieving an RL_min value of −66.41 dB. At a matched thickness of 1.85 mm, the effective absorption bandwidth (EAB) reached 10.46 GHz. Results indicate that the outstanding absorptive performance is primarily attributed to the impedance matching characteristics, providing a key technological strategy for developing high-performance, wideband microwave absorbers that are thin, lightweight, and robust.