Fabrication and characterization of Ba0.5Sr0.5TiO3-PANI/PS three-phase composites

Ba0.5Sr0.5TiO3 particles with perovskite phase were successfully synthesized by molten salt assisted co-precipitation using inexpensive TiOSO4 as raw material. The effect of the amount of molten salt on the formation, morphology, and dielectric properties of Ba0.5Sr0.5TiO3 particles was investigated. Ba0.5Sr0.5TiO3-polyaniline (PANI) hybrid particles were then synthesized by in situ polymerization of aniline with Ba0.5Sr0.5TiO3. The obtained Ba0.5Sr0.5TiO3-PANI hybrid particles were characterized through thermogravimetry (TG), X-ray diffraction (XRD), Fourier-transform-Infrared (FT-IR) and scanning electron microscopy (SEM). The three-phase composites by incorporating Ba0.5Sr0.5TiO3-PANI hybrid particles in Polystyrene (PS) matrix were demonstrated. SEM showed that the Ba0.5Sr0.5TiO3-PANI hybrid particles were distributed in the continuous PS matrix heterogeneously without obvious aggregation. Moreover, the glass transition temperature and thermal stability of composites were improved with the addition of hybrid particles. The three-phase composites were attractive candidate as embedded capacitors.