Investigation of electrical and thermal property of poly(vinyl alcohol)–calcium titanate nanocomposites

Abstract

The poly(vinyl alcohol):CaTiO3 nanocomposites were prepared by solution casting method using triethanolamine as a dispersive solvent in different weight percentages. The prepared nanocomposites have been characterized by FTIR and XRD for structural analysis. FTIR spectra show the important peaks of CaTiO3 and PVA which confirms the formation of nanocomposites. XRD pattern shows that the CaTiO3 has orthorhombic structure and its crystal structure does not distorted even after dispersion in PVA matrix. The TGA graph confirms that the addition of CaTiO3 (0.3 wt%) enhance the thermal stability of the nanocomposites. Further, the temperature dependent conductivity shows the increase in conductivity due to the tunnelling of charge carriers. Dielectric constant and dielectric loss of the 0.3 wt% of nanocomposites is low compare to other nanocomposites and hence its conductivity is high. It is found that the damping loss is 0.002% as indicated in quality factor and tangent loss is almost constant after 104 Hz which indicates that these nanocomposites can be used as low k-dielectric materials in electronic application.