Tunable dielectric properties and electromagnetic wave absorbing performance of MoS2/Fe3O4/PANI composite

Molybdenum disulfide (MoS2) has been considered as an excellent candidate for microwave absorption applications due to its appropriate electrical conductivity and large area size. In this study, the MoS2/Fe3O4/PANI nanocomposite (MFP), a MoS2 based ternary composite absorbing material with multiple heterostructures is prepared through composite with ferroferric oxide (Fe3O4) and polyaniline (PANI) and exhibits excellent microwave absorbing performance. Owning satisfactory impedance matching and multiple interfacial polarization, the minimum reflection loss of MFP can reach −50.3 dB at a thickness of 2.6 mm, and the effective absorption bandwidth is 5.1 GHz. Meanwhile, the whole X and Ku-band absorption can also be achieved with specific MoS2 loading at an optimized thickness. The ternary composite enhances the ability of electromagnetic waves attenuation by reducing dielectric constant and improving impedance matching, which is a novel medium adjusting strategy to provide a new insight for MoS2 in the field of microwave absorption and national defense security stealth technology.