Endogenous Fe Single-Atom-Induced Short-Range Graphitization Enables Integrated Electromagnetic Wave Absorption and Thermal Management in PTFE Composites

Modern electronics require polymer composites that integrate electromagnetic wave absorption (EWA) and thermal dissipation, yet these functions impose competing structural requirements. Herein, we construct Fe single-atom@short-range graphitized porous carbon (Fe1@SGC) that integrates electromagnetic attenuation and thermal conduction within a single material. Distinct from conventional exogenous metal-introduction routes, egg white serves as both the carbon source and coordination medium, enabling Fe single-atom anchoring without metal salts or organic ligands. Fe single atoms induce charge redistribution, polarization centers, and local ordering of carbon domains, synergistically regulating dielectric loss, thermal transport, and impedance matching. The multiscale carbon network further promotes electromagnetic wave penetration and multiple reflections/scattering. After incorporation into polytetrafluoroethylene (PTFE), the Fe1@SGC/PTFE composite achieves a maximum effective absorption bandwidth of 7.92 GHz and improved thermal conductivity. This work establishes endogenous single-atom-induced local graphitization as a ligand-free and structurally precise strategy for designing single-component fillers toward integrated EWA and thermal management.