Hybrid particles of Ag nanoparticles embedded in (Ba0.6Sr0.4)TiO3 fibers as fillers in polyvinylidene fluoride composites leading to excellent dielectric property

Polymer nanocomposites with high dielectric permittivity, which directly influence the size of electronic devices, are highly desired with the overwhelming of the 5G technology. In traditional method to fabricate polymer composites with high dielectric permittivity, ceramics with perovskite structure are used as fillers. But the improvement is very limited. Besides, efforts have been made by using conductive particles as fillers, which are based on the percolative theory. As the addition of the conductive particles achieves the percolation threshold, an ultrahigh dielectric permittivity can be produced, which however, is accompanied with a high dielectric loss. Herein, we try to design a hybrid particle, in which the silver particles are embedded in BST nanofibers, which combines the superiorities of both ceramic and conductive fillers. The hybrid particles were successfully synthesized via an electrospining technology. The prepared PVDF-based nanocomposites achieved a high permittivity of 88 and low loss tangent of 0.1 at 1 kHz and room temperature. It suggests that hybrid particles design is an effective means to adjusting the dielectric performance of polymer composites.