The structure and optical properties of PVA-BaTiO3 nanocomposite films

This paper aims to synthesize barium titanate (BaTiO3) nanocrystalline particles and to fabricate polyvinyl alcohol (PVA) films hosting BaTiO3 in order to enhance structural and optical properties. The tartrate precursor process is used to produce BaTiO3 nanocrystalline. By means of cast solution, the PVA - BaTiO3 nanocomposite films are prepared. The polymer films are described by X-ray diffractometer (XRD), Fourier-Transform Infrared (FTIR), UV-vis spectroscopy, and photoluminescence spectroscopy (PL). The study of XRD and FTIR indicates that complexity is established between BaTiO3 nanoparticles and PVA matrix. Furthermore, XRD analyzes emphasize a reduction in the crystallinity of polymer films by increasing of BaTiO3 nanoparticles within the matrix of PVA. It is noticed that as the BaTiO3 nanoparticles concentration increases in the PVA matrix, the optical band gap decreases while the Urbach energy increases. The PL spectra for PVA-BT films showed a photoemission peak at about 750 nm. This peak decreases in intensity and broadened with the increase of the BT concentration in the PVA matrix, which is related to the defects produced and causes disordering in the polymer matrix. The extinction coefficient, refractive index, optical conductivity and dielectric constants of the polymer films are also improved.

Automated summary

This study aimed to synthesize BaTiO3 nanocrystalline particles using the tartrate precursor process, and then prepare nanocomposite films with PVA. Analysis using XRD and FTIR showed complex interactions between BaTiO3 nanoparticles and the PVA matrix. As the concentration of BaTiO3 nanoparticles in the PVA matrix increased, the optical band gap decreased while the Urbach energy increased.