Investigation on the optical properties of (PVP/PVA)/Al2O3 nanocomposite films for green disposable optoelectronics

The ultraviolet-visible (UV-Vis) range (200-800 nm) optical behaviour of nanocomposite films consisted of poly (vinyl pyrrolidone)/poly (vinyl alcohol) (PVP/PVA) blend matrix and alumina (Al2O3) nanofiller (1-5 wt%) was characterized for their eco-friendly green technology-based optoelectronic device applications. Absorbance, transmittance, and reflectance spectra of the (PVP/PVA)/Al2O3 films were analyzed to determine absorption coefficient, energy band gaps (direct and indirect), and Urbach energy. The non-linear decrease in band gap values of these composites with increasing amount of Al2O3 in the polymer matrix was explained. The wavelength-dependent values of refractive index, extinction coefficient, complex dielectric permittivity, and optical conductivity of these hybrid nanocomposites enhanced non-linearly with increasing filler concentration, as well as the dispersive energy, single oscillator strength, and optical susceptibility increased gradually. All these optical parameters values of the (PVP/PVA)/Al2O3 nanocomposites are found controllable by Al2O3 contents and reasonably comparable with the results of other similar types of composites.

Automated summary

The UV-Vis optical behavior of nanocomposite films composed of PVP/PVA blend matrix and Al2O3 nanofiller was studied for potential optoelectronic device applications. The band gap values of the composites decreased nonlinearly with increasing Al2O3 content, while various optical parameters could be controlled by the filler concentration.