Preparation and dielectric property of Ag/PVDF composite film

Conductive particle fillers could improve the dielectric properties of the polymer matrix. By solvent casting method, different volume fraction of nano silver particles were added into the PVDF film to prepare Ag/PVDF composite film so as to increase the dielectric properties of the materials. SEM was used to analyze the microstructure of the films. SEM images show that nano Ag filler particles were uniformly distributed throughout the whole matrix of the composite films. Dielectric property tests show that with the increase of nano Ag content, the dielectric constants of the composites increase first and decrease later while the dielectric losses decrease first and increase later. In the case of the optimal 17vol% Ag content, the dielectric constant of the composite film is the highest (14.5 at 100 Hz) with lower dielectric loss, and the energy storage density is relatively high (0.340 J·cm^-3).