Multicomponent synergistic flower-like FeS/hollow C fiber for tunable and efficient microwave absorption

[Display omitted] •Hollow carbon fiber were derived from biomass substrate.•A facile method to design hollow carbon loaded with flower-like FeS.•Unique FeS/Hollow C morphology contributing to electromagnetic absorption.•Minimum reflection loss reaches to − 65 dB under 2.2 mm. Selecting suitable components and microstructure are effective way to design intense coupling of wave impedance and electromagnetic dissipation capacity in the field of electromagnetic (EM) wave absorption materials. Herein, we propose the construction of a novel composite composed of carbon fibers derived from biomass serve as a skeleton to support the loaded with flower-like FeS (FeS/hollow C). The unique microstructure creates the generation of abundant heterogeneous interfaces, impedance matching and multiple loss mechanism, allowing for synergistic effect of dielectric loss and magnetic loss, thereby promoting their EM absorbing properties. The FeS/hollow C absorber exhibited excellent EM wave absorption performance, with an effective absorption bandwidth (EAB) of 7.20 GHz, and a minimum reflection loss (RL) of −65 dB with the thickness of 2.2 mm. The study provides a new strategy for constructing composite absorbers with ingenious structures, which is significant for the preparation, development, and functional application of biomass-based materials.