Influence of shell architecture on dielectric loss suppression and relaxation dynamics of PVDF/BaTiO₃@Al₂O₃ polymer nanocomposites

Abstract

As purchased PVDF and synthesized Core-Shell BaTiO3@Al2O3 [BT@ALO] nanostructures through heteronucleation method were used to synthesize the cold pressed PVDF/BT@ALO polymer nanocomposites as innovative polymer dielectrics. The structure and microstructures were confirmed through XRD, FESEM, and TEM studies. Analysis of Dielectric results show that during the cold pressing method, the spherulites of PVDF were preserved, which led to an increase in the effective dielectric constant and the thickened insulating shell layer leads to suppression of dielectric loss ~ 0.04, obtained due to the addition of 20 wt% of BT@ALO into the PVDF matrix. AC conductivity is well-fitted with Jonscher’s power law and modulus spectra show a non-Debye type relaxation with stretching coefficient ‘β’ in the range of 0.3 to 0.4, which is less than 1. These PVDF/ BT@ALO PNC may be used as high-performance dielectric materials for next-generation capacitors and other energy storage applications. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2026.