Interfacial Synthesis of Polyaniline/MoS₂ Nanocomposite Thin Films for Transparent Supercapacitors

This work describes a strategy to synthesize nanocomposites of polyaniline (PAni) and molybdenum disulfide (MoS₂) directly as thin films at the interface between immiscible liquids. Based on the interfacial polymerization of aniline in a biphasic acidic aqueous solution/toluene system, four nanocomposites were synthesized by varying the nature and concentration of the acid (HCl or H₂SO₄), resulting in films with high homogeneity, transparency, and ease of transfer. The films were characterized by using a range of spectroscopic, microscopic, diffraction, and electrochemical techniques. The results show that a simple modification of the aqueous phase during synthesis led to materials with distinct morphologies, polymer doping levels, and electrochemical properties, as well as different levels of interaction between the components. Furthermore, the films demonstrated potential for application as electrodes in aqueous and transparent supercapacitors, with the highest observed volumetric capacitance exceeding 800 F cm^-3.