CNTs/biomass carbon composites derived from dictyostelium for electromagnetic wave absorption

A novel biomass carbon (BC) composites derived from dictyostelium loaded with CNTs were successfully fabricated by simple carbonization and ultrasonic oscillation process. The microstructure and electromagnetic wave absorption (EMA) property as well as the related mechanism of as-prepared CNTs/BC composites were investigated. The unique porous structure of BC material provided more transmission paths for charge and enhanced multiple reflection and scattering of electromagnetic wave. With the introduction of highly conductive CNTs, not only the conductance loss and relaxation polarization loss of CNTs/BC composites was enhanced, but also the impedance matching was improved. With the synergistic effect of favorable impedance matching and attenuation ability, the excellent EMA property was achieved that the minimum reflection loss (RL min ) is −20.4 dB with the wide effective absorption bandwidth (EAB) of 2.73 GHz at a thickness of 2.35 mm. This study will provide a valuable reference for exploring new biomass-carbon based EMA materials. • High-performance CNTs/biomass carbon composites derived from dictyostelium • Unique porous structures formed through a carbonization process. • Improved EMA property with an effective absorption bandwidth of 2.73 GHz