Broadband Microwave Absorption by TiO ₂ -Modified MXene Nanosheet Composites

Against the backdrop of increasingly severe electromagnetic pollution, fabricating high-performance, lightweight broadband electromagnetic wave-absorbing materials has become an exigent requirement. However, potential materials, such as MXene, suffer from critical bottlenecks in their traditional preparation methods, process hazards, time-consuming, and result in materials with poor microwave absorption performance. Herein, an innovative microwave-assisted molten salt synthesis strategy that employs ZnCl2 under microwave irradiation to obtain the TiO2 nanoparticle-modified W-Ti3C2 composites. At a thickness of 2.53 mm, the lowest reflection loss (RLmin) is −64.2 dB. The effective absorption bandwidth (EAB) achieves 8.79 GHz when the thickness is 3.55 mm. The immense potential of a cost-efficient and environmentally friendly route of preparation can be applied in the construction of high-performance broadband microwave absorbers.