Microwave absorption properties of CoS2/TiO2/Ti3C2Tx MXene composites

Abstract

Summary: Cobalt disulfide (CoS2) nanoparticles were combined with varying amounts of MXene (Ti3C2Tx) sheets via a hydrothermal method for microwave absorption applications. X-ray diffraction confirmed the coexistence of crystalline CoS2, Ti3C2Tx, and TiO2 phases, revealing the partial surface oxidation of Ti3C2Tx sheets. Scanning electron microscope images demonstrated that CoS2 nanoparticles were uniformly anchored on the MXene sheets, and X-ray photoelectron spectra showed the presence of Co–S, Ti–C, and Ti–O bonds, indicating strong interfacial interactions. The CoS2-35 wt % Ti3C2Tx composite exhibited a minimum reflection loss of −15.23 dB at a matching thickness of 2.4 mm and a broad effective absorption bandwidth of 7.3 GHz (from 10.7 to 18 GHz) at 3.2 mm, which was mainly attributed to impedance matching. Synergistically, the presence of multiple interlayer interactions and the extension of the wave-propagation path within the layered microstructure of the CoS2-35 wt % Ti3C2Tx composite mutually contribute to wave attenuation.