Multi-topological network engineering of Co/MnO composites for electromagnetic wave absorption

The study of delicate nano-topological structures has been a prominent area of research, largely due to the distinctive electromagnetic characteristics of this structure. However, the relationship between topological transformations, material properties, and electromagnetic wave (EMW) absorption performance remains insufficiently understood. In this study, a series of carbon fiber-based Co/MnO nanocomposites is derived from Co/Mn bimetal Prussian blue analogs encapsulated in polymer nanofiber networks by electrospinning. It has been demonstrated that various topological shapes can be modulated by modulating surfactants, thereby changing the degree of graphitization and electrical conductivity. The optimized spherical precursor composite carbon fiber exhibits superior EMW absorption capability with minimum reflection loss (RL_min) of −58.15 dB with a thickness of 2.3 mm. Moreover, ultrabroad effective absorption bandwidth (EAB) as large as 8.96 GHz is obtained. This work offers a significant contribution to the field of topology, while also promoting the development of manganese-based microwave-absorbing materials (MAMs) with enhanced electromagnetic absorption properties.