Structural and Electrical Studies on Ferroelectric Polymer Nanocomposites

Abstract

Nano dispersed (PZT and ZnO) PVDF composite films have been developed via spin coating techniques from the mixed solvent system [mass ratio of 5:5 (THF/DMF)]. The chemical, structural, physical, morphological and dielectric properties were studied by using Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), Scanning electron microscopy (SEM) and LCR meter (50Hz to 1 MHz). X-ray diffraction and IR analysis confirmed the formation of pure well crystalline β-phase. SEM studies inferring about the homogenous dispersion of the nano particles in PVDF matrix. Dielectric behaviour of these composite films has been studied to understand the molecular motion at different frequencies. We found the increase in the relative permittivity at the lower concentrations of PZT (.001 wt %) particles, however, in ZnO dispersed composite films permittivity displayed higher magnitude at higher concentration (.007 wt %). The conductivity of such systems has also been estimated. Such composite matrices can be utilized in varying application to fabricate the low and high dielectric constant and memory devices.