Preparation and microwave absorbing properties of MoS₂/biomass carbon composite

In order to solve the problem of low conductivity of MoS₂ absorbing material, the MoS₂/biomass carbon (BC) composite material was prepared by using shaddock peel (SP) as the raw material, using one-pot hydro-thermal and high-temperature calcination methods. The content of MoS₂ in the composite material was adjusted by adjusting the content of the initial Mo source and S source. The results of microscopic morphology, structure and electromagnetic parameters show that with the increase of the MoS₂ content in the composite material, the scattered distribution of MoS₂ on the BC surface changes from flakes to flower-like coatings, and the conductivity and complex permittivity of MoS₂/BC composites gradually decrease. By adjusting the ratio of MoS₂ to BC, the effective control of the electromagnetic parameters of the MoS₂/BC composite material is realized, and its impedance matching characteristics are optimized. The flower-like structure of MoS₂ facilitates the multiple reflection/scattering of electromagnetic waves. At the same time, there are abundant interfaces between flower-like MoS₂ and BC, which is beneficial to promote interface polarization and enhance the attenuation ability of MoS₂/BC composites to electromagnetic waves. The prepared MoS₂/BC-0.8 has a minimum reflectance loss (RL) value of –40.1 dB, and an effective absorption bandwidth of up to 5.9 GHz (11.1-17.0 GHz).