GLPD-assisted construction of porous, nano-worm-like dielectric-magnetic heterointerfaces for electromagnetic absorption

Dielectric-magnetic heterointerfaces can enhance electromagnetic wave (EMW) absorption by promoting interfacial charge redistribution and relaxation, but their formation remains difficult to control due to mismatched ionic diffusion, nucleation, and growth kinetics. Here, we develop a gas-liquid phase deposition (GLPD) strategy, assisted by Bi 3+ diffusion regulation, to construct porous, nano-worm-like, interconnected dielectric-magnetic networks. By exploiting differences in cation oxidizing ability, the reaction sequence and phase conversion are regulated during interfacial formation. The resulting high-aspect-ratio architecture lowers charge-transfer resistance and facilitates carrier transport, contributing to conduction-related loss. Meanwhile, the magnetic phase is uniformly distributed throughout the interconnected network, forming ordered magnetic pathways with a strong response to alternating magnetic fields. In addition, the pronounced work-function difference at the Bi 2 O 3 -Co heterointerface induces asymmetric electron localization-delocalization behavior and interfacial electron accumulation, strengthening interfacial polarization. Consequently, Bi 2 O 3 -Co delivers a 7.20 GHz effective absorption bandwidth at 2.10 mm, and Bi 2 O 3 -Fe 2 O 3 further demonstrates the extensibility of this strategy.