Ti3c2tx Mxene@Cofe-Mofs Derived Compoites as High-Performance Electromagnetic Wave Absorbers

Abstract

The development of metal-organic frameworks (MOFs)-derived wave-absorbing materials with the advantages of low reflection loss (RL), wide effective absorption bandwidth (EAB), low filler loading, and thin matching thicknesses has been considered as an effective strategy to address electromagnetic wave pollution. However, designing reasonable structures to meet the requirements of advanced wave-absorbing materials is still a great challenge. In this paper, CoFe-MOFs were prepared by solvothermal method with terephthalic acid as ligand and composited with MXene nanosheets by electrostatic adsorption as MXene@CoFe-MOFs which was followed by pyrolysis to prepare MXene@CoFe@C. The structure of MXene@CoFe@C was confirmed by Scanning Electron Microscope, Transmission Electron Microscope, and the wave-absorbing properties and absorbing mechanism were investigated. The results show that the selection of ligands play an important role on the absorption performance, and the combination of magnetic nanoparticles CoFe@C and dielectric material MXene can achieve good impedance matching. In addition, the enhancement of interfacial polarisation and dipolarisation can further achieve the absorption of electromagnetic waves. Precisely, when the MXene filling amount is 150 mg, the RLmin of the composite is -74.48 dB, the EAB is 8.53 GHz, and the optimal matching thickness is 3.16 mm. The results of this study are useful for the design and development of high-performance microwave-absorbing composites based on MOFs and MXene.

Keywords: Ti3C2TX MXene@CoFe-MOFs, electromagnetic wave absorbers, dielectric and magnetic losses