Bamboo-derived hierarchical honeycomb structure–driven N-Carbon/Fe/Fe3C hetero-multiphase interfacial architecture

We propose a hierarchical honeycomb skeleton heterogeneous multiphase interface synergistic absorber element design for complex electromagnetic spectrum fields driven by 5 G/AI. Using delignified bamboo as a three-dimensional template, a heterogeneous multiphase interface network of N-carbon/Fe/Fe 3 C was constructed. Cellular channels provide continuous topological propagation paths and multi-level scattering; Nanoscale heterojunctions form high-density interface libraries, which, together with controlled conductivity loss, texture multi-component attenuation channels, triggering interface polarization and dipole relaxation. In addition, the heterojunction interface regulates the local field and charge redistribution, and the nano magnetic domain achieves band adjustable magnetic loss coupling, reshaping impedance matching. At a thickness of 1.45 mm, an effective absorption bandwidth of 5.8 GHz ( RL min of −51.3 dB) was achieved, presenting a synergistic advantage of thin layer, broadband, and strong attenuation. This work demonstrates a multi-scale energy dissipation system centered around heterogeneous multiphase interfaces and hierarchical honeycomb structures, constructing an absorption architecture with programmable coupling and tunable spectral bands. Provide a universal pathway for high-value biomass and engineered microwave absorbers. • Delignification tailors component/structure of bamboo-derived scaffold. • Hierarchical honeycomb enables multi-scale scattering and impedance matching. • In-situ formed N–C/Fe/Fe 3 C interfaces enhance polarization and magnetic loss. • Achieves 5.8 GHz bandwidth at 1.45 mm with strong absorption (-51.3 dB). • A sustainable strategy for high-value biomass-based EMW absorbers.