Enhancing electromagnetic wave absorption performance of Co₃O₄ nanoparticles functionalized MoS₂ nanosheets

The 2D molybdenum disulfide nanosheets (MoS₂-NS) has exhibited great potential in electromagnetic wave absorbing (EMA) due to larger surface area and peculiar electronic properties. However, due to the poor impedance matching and limited electromagnetic loss capability of pure MoS₂-NS, its practical applications are significantly challenging. Herein, we firstly implanted Co₃O₄ nanoparticles (Co₃O₄-NPS) on MoS₂-NS by a facile hydrothermal method to improve the EMA performance. The resulting MoS₂/Co₃O₄ hybrids exhibit the minimum reflection loss (RL) value of −43.56 dB at 6.96 GHz with 20 wt% Co₃O₄ loading under the samples thickness of 4.0 mm. The widest bandwidth with the RL value less than −10 dB of MoS₂/Co₃O₄ hybrids was determined to be 4.76 GHz (13.24 to 18 GHz) under the absorber thickness of 2.0 mm. The excellent performance is ascribed to that implanted Co₃O₄-NPS on MoS₂-NS could turn tuning impedance matching and improving synergetic magnetic loss and dielectric loss. Herein, this work not only presents a facile strategy of achieving high-performance MoS₂-based EMA materials, but also provides important implications for designing the other EMA materials.