Synthesis of Co3O4@C/Ni/Ti3C2Tx MXene composites with "sandwich" three-dimensional structure for enhanced electromagnetic wave absorption

In order to effectively deal with the threat of electromagnetic pollution to health and the safety of electronic devices, this study innovatively designed and synthesized the sandwich-structured high-efficiency microwaveabsorbing material Co3O4@C/Ni/Ti3C2Tx by integrating hydrothermal and electrostatic self-assembly technologies to address the hazards of electromagnetic pollution. The multilayered conductive skeleton of Ti3C2Tx MXene serves as an intermediate layer, which not only endows the material with excellent electromagnetic modulation properties, but through its large specific surface area and unique interlayer interactions, the layers can also deeply guide and efficiently scattering electromagnetic waves. In the middle of the sandwich is a Co3O4@C/Ni core-shell structure, which significantly enhances the trapping and dissipation of electromagnetic waves due to its complex internal reflection mechanism. This well-designed sandwich structure achieves an ultralow reflection loss of -42.2 dB under optimized conditions and an effective absorption bandwidth of 8.5 GHz over a wide frequency range from 2 to 18 GHz, meaning that it can provide stable and highly efficient electromagnetic shielding over an extremely wide frequency range, which provides valuable insight and direction for the design and development of high-performance microwave absorbing materials in the future, and predicts that the MXene-based composite materials will show a broad application prospect in many fields such as electromagnetic protection, stealth technology, wireless communication and so on.