Mn/Sn-Based Sulfides/Graphite Nanosheet Composites for Electromagnetic Wave Absorption

Abstract

As awareness of electromagnetic wave (EMW) pollution increases, the demand for efficient wave-absorbing materials grows. Composite materials, with their diverse loss mechanisms, have arisen as key technologies for the absorption of EMW. Metal sulfides hold significant promise due to their outstanding properties and the ability to tune their microstructures. Nevertheless, there is still a need for further enhancement of the absorption performance. In this study, the binary metal sulfides MnS/MnSn₂ were synthesized by reacting manganese powder with tin disulfide (SnS₂) at various molar ratios. Subsequently, the EMW absorption material MnS/MnSn₂/G was prepared by ball-milling these sulfides with graphite, integrating both magnetic and dielectric loss mechanisms. The resultant material exhibited enhanced impedance matching and dielectric polarization, significantly improving the EMW absorption performance. Notably, the MnS/MnSn₂/G composite demonstrated an effective absorption bandwidth of 3.55 GHz and a minimum reflection loss of −59.84 dB. This work can provide some insight for researchers and practitioners involved in the synthesis and optimization of metal sulfides.