Customizing the structure and chemical composition of ultralight carbon foams for superior microwave absorption performance

Developing biomass-derived three-dimensional porous carbon materials (porous foam, PCF) has become a common strategy to obtain lightweight and efficient electromagnetic microwave-absorbing materials. Without the introduction of template subsequent activation process, several ultra-lightweight honeycomb PCF samples were successfully prepared from dried ballonflower/yamakurage (DB) by simple calcination. In addition, calcination temperature plays decisive role in regulating pore size, composition microwave absorption properties samples. Furthermore, it is worth noting that different cutting directions also influenced hole size sample performances. Under combined effects multiple reflections scattering structure, dipole polarization abundant heterogeneous atoms good conductive loss material, vertical PCF-900V exhibits optimal performances with minimal reflection (RLmin) value ?46.95 dB at 1.46 mm thickness effective bandwidth (EAB) 5.52 GHz 1.72 matching respectively, indicating its great potential for application as promising absorbing material.