MOF derived α-Fe2O3/Ti3C2Tx magnetic-dielectric composites for microwave absorption

Abstract

The design and development of microwave-absorbing materials with excellent performance hold significant importance in both civil and military fields. The combination of magnetic loss materials and dielectric loss materials can achieve complementary performance effects and regulate impedance matching. In this paper, spindle-like α-Fe2O3 was synthesized using MIL-88A as a template, which was then composited with Ti3C2Tx phase possessing excellent electrical conductivity to obtain Fe2O3/Ti3C2Tx composites. Ti3C2Tx can provide good conductance loss and dipole polarization relaxation, while the incorporation of Fe2O3 between the layers of Ti3C2Tx not only triggers the interfacial polarization effect but also increases layer spacing, thereby enhancing multiple reflection effects. Furthermore, the magnetic-dielectric synergies further optimize the impedance matching. Through the combined action of multiple mechanisms, the Fe2O3/Ti3C2Tx composites (with a mass ratio of 1:3 for Fe2O3 and Ti3C2Tx) exhibit a minimum reflection loss of −34 dB and an effective absorption bandwidth of 1.53 GHz at a thickness of 3 mm, as well as an effective absorption bandwidth of 2.805 GHz at a thickness of 1.5 mm. This paper presents a reference strategy for constructing highly efficient microwave absorbers derived from Metal-organic frameworks (MOFs) and MXene based on their outstanding properties.