Effect of shell‐layer thickness on dielectric properties in Ag@TiO2 core@shell nanoparticles filled ferroelectric poly(vinylidene fluoride) composites

The Ag@TiO 2 core@shell nanoparticles filled ferroelectric poly(vinylidene fluoride) (PVDF)-based composites (0-3 connectivity) were prepared in order to study the effect of core@shell structure on dielectric permittivity in the Ag@TiO 2 /PVDF nanocomposites. The Ag@TiO 2 core@shell nanoparticles were synthesized via a water-thermal meting route. Transmission electron microscope (TEM) images showed the nanoparticles were about 60-120nm in diameter and the thickness of the shell layer was about 6-12 nm, which can be adjusted by changing the fabrication conditions. Results of dielectric measurements showed that the shell-layer thickness of the Ag@TiO 2 core@shell nanoparticles played a key role in deciding the final values of the dielectric properties of the nanocomposites. The variation of dielectric properties of the nanocomposites with temperature also depends on the shell-layer thickness of the Ag@TiO 2 core@shell nanoparticles.