Large-Scale Nanofiber Manufacturing| Synergistic Polarization Relaxation in Heteroatom-OptimizedHeterointerfaces for Electromagnetic Wave Absorption

Professor Wu Guanglei (Qingdao University) Adv. Funct. Mater.: Synergistic Polarization Relaxation via Heteroatom-Optimized Heterointerfaces in Electromagnetic Wave Absorption

Challenge: Regulating heteroatoms and heterointerface properties is a promising strategy to enhance electromagnetic wave (EMW) absorption. However, precise control of heteroatom doping and understanding their synergy with heterointerfaces remain challenging.

Approach: Professor Wu Guanglei’s team proposed a heteroatom-optimization strategy to enhance synergistic polarization relaxation, offering insights for designing advanced EMW absorbers.

Innovation 1: N/O-doped nanofiber-based Ni-Fe nanocubes were synthesized by pyrolyzing Fe-MOFs under NH₃, H₂/Ar, or Ar atmospheres. Heteroatoms critically tuned electronic structures and heterophase interfaces to boost polarization.

Innovation 2: Fe₂N@Ni₃Fe/CNFs achieved exceptional EMW absorption:

• Minimum reflection loss: −56.75 dB at 2.3 mm thickness.

• Effective absorption bandwidth: 6.7 GHz.

• Corrosion resistance from fibrous network structure.