Study the Effect of Copper Chloride II (CuCl₂) on Optical Properties of Polyvinyl Alcohol (PVA)

Abstract

The optical properties of polyvinyl alcohol (PVA) doped with copper chloride II (CuCl₂) were studied. The copper chloride was added to polyvinyl alcohol with different concentrations (0, 1, 3, 5, 7, and 12 wt.%). The PVA:CuCl₂ films were prepared using the casting techniques. The absorption and transmission spectra have been recorded in the wavelength range (300-800) nm by using UV-VIS spectrophotometer. The fundamental optical parameters such as optical band gap energy, refractive index, extinction coefficient, and dielectric constants have been investigated. Results show that by adding copper chloride to PVA, the optical parameters (refractive index, extinction coefficient, real and imaginary dielectric constant) are increasing with the increase of concentrations of CuCl₂ While the optical band gap energy decreases. The single oscillation energy E₀ and the dispersion energy E_d were determined by using the Wemple-DiDomenico model. The results show that E₀ and E_d values increase with increasing the dopant CuCl₂ concentration.

Keywords:
Polyvinyl alcohol (PVA); casting techniques; optical constant; optical band gap; PVA:CuCl₂ films; Wemple-DiDomenico model