Hybrid Core-shell Structured BaTiO₃@PEDOT Nanocomposite Preparation And Its Applications In Dielectric And Electrode Materials

A new hybrid core-shell structured nanocomposite, BaTiO3 with surface grafted poly (sodium styrenesulfonate) (PSS) as core and conductive poly (3,4-ethylenedioxythiophene) (PEDOT) as shell was prepared. The BaTiO3 nanoparticles were first modified with grafted PSS to improve their dispersion stability and compatibility with polymer base. In order to provide the nanocomposites with additional conductivity, EDOT was polymerized via chemical oxidation using PSS as a dispersant and dopant to form a conductive shell layer. TEM reveals the formation of core-shell structured BaTiO3@PEDOT nanoparticles, and the average size is about 220-260 nm with shell thickness of 20-60 nm. As electrode material, the specific capacitance of the BaTiO3@PEDOT composite can reach 63.7 F g-1, which was much higher than that of the unmodified BaTiO3 (1.95 F g-1). As dielectric filler, PVDF based composite with high dielectric constant and low dielectric loss were successfully obtained through blending BaTiO3@PEDOT into PVDF, and the dielectric constant of the BaTiO3@PEDOT/PVDF composites can reach 20 while their dielectric loss is only 0.12. Due to its high dielectric constant, good processing performance and good stability, this new type of composite materials have great application prospect in many fields such as optics, optoelectronic devices, and so on.