Abstract

With the objective to investigate the influence of zinc oxide–cerium oxide (ZnO-Ce2O3) nanoparticles on the
optical and electrical properties of polyvinyl alcohol (PVA), PVA/ZnO-Ce2O3 nanocomposite films were
prepared by solution intercalation method with different weight percentage viz., 0.5, 1.0 and 2.0 wt% of ZnO–
Ce2O3 nanoparticles. The fabricated nanocomposites were characterized by Fourier transform-infrared
spectroscopy (FT-IR), UV/visible and X-ray diffraction (XRD). The effect of ZnO-Ce2O3 nanoparticles on the
dielectric constant (ε′), dielectric loss (ε ′′), electric modulus (M′ and M′′), ac conductivity (σac), and dielectric
loss tangent (tan δ) over a range of frequencies at room temperature of PVA nanocomposites have been studied.
FTIR, UV visible and XRD analysis indicates the nature of ZnO-Ce2O3 nanoparticles interaction with the PVA
matrix. The morphological behavior of the nanocomposites has been performed using scanning electron
microscopy (SEM). The dielectric behaviors such as dielectric constant (ε′) and dielectric loss (ε′′) increases
with increase in nanoparticle concentration, but decreases with increase in frequency. But, the electric modulus
(M′) increases with increase in frequency. Dielectric loss tangent (tan δ) decreases with increase in filler
content at lower frequency, but at higher frequencies the tan δ increases with increase in nanoparticles content.
AC conductivity (σac) of PVA/ZnO-Ce2O3 nanocomposites increases with increasing frequency following the
universal dielectric response law.