Construction of Strong Coupling Interface between CoZn@NC and CuS for Ultrathin Electromagnetic Wave Absorption

Pollution from electromagnetic waves has prompted the development of high-performance electromagnetic wave (EMW) absorbers. However, single-component absorption materials cannot meet current performance requirements. Therefore, multi-component composites become the focus of research. Here, CoZn-based metal organic framework (CoZn-ZIF-L) nanosheets are synthesized and transformed into nitrogen-doped carbon-wrapped CoZn nanoparticles (CoZn@NC). Subsequently, a hydrothermal process was used to compound ultrasmall CuS nanoparticles on surface of the CoZn@NC to construct a strong interface coupling structure, effectively combining the dielectric properties of CoZn@NC and CuS. It is experimentally demonstrated that the optimized heterostructure exhibited significantly enhanced EMW absorption capacity, with a reflection loss (R_L) of −56.2 dB, a matching thickness of only 1.46 mm, and an effective absorption bandwidth (EAB, R_L ≤−10 dB) of 3.6 GHz. This work provides an efficient way to design high-performance EMW absorption materials with strong interface coupling.