Construction of lychee-like MoS2 microspheres on rice husk-derived porous carbon for enhanced dielectric loss and efficient electromagnetic wave absorption

Biomass porous carbon has attracted significant attention in wave absorption for its ultra-light, low cost and easy availability. Herein, lychee-like MoS2-doped rice husk-derived porous carbon (RPC@MoS2) composites were successfully prepared for electromagnetic wave absorption (EMA). The unique crocodile skin-like porous structure of rice husks and the lychee-like structure of MoS2 microspheres significantly develop numerous heterogeneous interfaces and increase the transmission path of electromagnetic waves (EMWs), which play an essential role in the dissipation of EMWs. The suitable dielectric constant of the composite can be got by simply changing the heat treatment temperature. RPC@MoS2-600 shows good EMA performance with a minimum reflection loss (RLmin) of -50.69 dB at 2.2 mm and an exceptionally wide effective absorption bandwidth (EAB) of 6.375 GHz at 2.0 mm. This work provides a new idea for the design of novel, low-cost, high-performance EMW absorbing materials.