Multidimensional Nanostructures Design of Poly‐Imidazolium Salts Derived N‐Doped Carbon Materials for Electromagnetic Microwave Absorption

Abstract Poly‐imidazolium salt (PIS) combines the merits of abundant nitrogen sources, excellent chemical and thermal stability and adjustable morphology, making it a promising precursor for Nitrogen‐doped (N‐doped) carbon material. Herein, multidimensional PIS are synthesized via a facile solvent‐induced strategy. Then, PIS are converted into nanofibers, nanoribbons and microspheres composed of N‐doped carbon. The effects of microstructure, N‐doping degree and defects on microwave absorption properties are investigated in depth. As a result, the 2D nanoribbon CN‐2‐700 features a high specific surface area, significant N‐doping and moderate conductivity, thereby allowing it to sustain perfect conductive networks and the optimal impedance matching at a low filler content (8 wt.%). CN‐2‐700 demonstrates a minimum reflection loss (RL min ) of −50.15 dB and an effective absorption bandwidth (EAB) of 7.06 GHz (10.44–17.50 GHz). Overall, this work offers a novel path for developing multi‐dimensional electromagnetic microwave absorbing materials with a simple process and remarkable performance.