Synthesis and characterization of high-performance electromagnetic wave absorption of CoS/Co9S8/WS2 composites

The heterogeneous CoS and WS2 composites were prepared via the simple hydrothermal method. The introduction of WS2 can reinforce the electrical conductivity of the composites. The introduction of WS2 can augment the specific surface area and pore space of the composite; polarization occurring in the two different materials results in enhanced absorption of electromagnetic waves. By changing the mass fraction of WS2 in CoS/Co9S8 materials, the composites can absorb electromagnetic waves to the greatest extent possible. When the CoS/Co9S8/WS2 composite containing 10 wt% of WS2, attains the minimum reflection loss (RLmin) of - 29.3 dB at the thickness of 1.3 mm in 16.9 GHz when the filler loading is 50 wt%. The results of the above experimental data prove that the prepared CoS/Co9S8/WS2 composites have the superiority of simple preparation, low weight, strong absorption capacity, thin thickness and wide bandwidth, which has high research value in microwave absorption field.