Preparation of NiS/TiCT co-doped with N and P at the covalent interface and its electromagnetic wave absorption properties.

The harm of electromagnetic waves on human daily life has gradually received attention, and electromagnetic waves absorption materials have been used to address this issue. MXene, as a new type of 2D material, is a very promising electromagnetic wave absorption material. In this study, NiS nanoparticles were grown on the surface of S terminated TiCT, and -S group acted as sulfur sources to construct Ti-S-Ni covalent interface directly in NiS/TiCT composites. To further regulate the interface structure and electromagnetic properties, -P and -NH groups were also introduced onto the surface of MXene to achieve the N, P co-doping NiS/TiCT composites with covalent interface. By investigating the electromagnetic wave absorption performance of the composites, it was found that N and P doping could effectively enhance the electron transfer rate at the interface and optimize the conduction loss, resulting in a significant improvement in performance. The minimum reflection loss was -50.6 dB at a frequency of 15.6 GHz, and the matching thickness was only 1.14 mm with an effective absorption bandwidth of 3.6 GHz. These results provide an important references and guidance for further research and development of high-performance electromagnetic wave absorption materials.