Metal-p(C3O2)X assembling enables constructing 2D metal/C nanocomposites for broadband electromagnetic wave absorption

Two-dimensional (2D) materials are considered excellent electromagnetic wave absorbing (EMW) materials because of their ultrathin characteristics, ultra-large specific surface area, and excellent processing properties. However, existing preparation methods (e.g., mechanical stripping, chemical vapor deposition) are difficult to balance between cost, scale and quality. In this study, polymer semiconductor p(C3O2)x with controllable 2D nanosheets micromorphology and enriched with oxygen-containing groups is introduced as a precursor. Its rich oxygencontaining groups can be used as anchor sites for metal ions. The results show that the prepared samples all exhibit a 2D nanosheets structure. Due to the structural features of 2D materials, numerous heterointerfaces are formed within the composites, greatly promoting interfacial polarization. Moreover, oxygen incorporation and crystalline defects substantially improve dipole polarization. The incorporation of metallic components further boosts the magnetic loss performance. Benefiting from the combined influence of multiple attenuation mechanisms and distinctive microstructural properties, the OC-Cu achieves a minimum reflection loss (RLmin ) of -63.7 dB and an effective absorption bandwidth (EAB) of 6.44 GHz. This work provides a new idea for the construction of high-performance EMW absorbing materials.