Regulating polarization loss behavior of WS2/WO3/PPy nanocomposites by interface engineering to enhance electromagnetic wave absorption performance

Interfacial polarization has been proved to significantly contribute to the effective absorption of electromagnetic waves (EMW). However, a model that clearly defines the contribution of interfacial polarization has yet to be developed. In this work, a layer of WO3 was introduced within the WS2/PPy nanocomposites by oxidation to create a heterojunction interface, resulting in the formation of a WS2/WO3/PPy nanocomposite material. The experiments demonstrated that interfacial engineering could significantly enhance the electromagnetic wave absorption capability of the material. The WS2/WO3/PPy composite achieved a minimum reflection loss (RLmin) of-58.87 dB at a thickness of 3.3 mm and an effective absorption bandwidth (EAB) of 6.72 GHz at a thickness of 2.3 mm. This work clarifies the impact of interfacial polarization on EMW absorption, providing a feasible approach for designing novel, high-efficiency EMW absorbing materials.