Structural, linear/non-linear optical, and optoelectrical properties of PVB/Bi ₂ WO ₆ nanocomposite for industrial applications

Abstract

Nanocomposite films composed of polyvinyl butyral (PVB) and B i2 WO 6 were produced through solution casting. The goal of this investigation was to examine the effects of different Bi 2 WO 6 concentrations (0%, 2%, and 4% wt.) on the linear/non-linear optical and optoelectrical properties, as well as the structure and dispersion of films of PVB/Bi 2 WO 6 nanocomposite. The direct band gap Eg 1 value falls from 5.1 eV to 3.83 eV with the progressive increase in Bi 2 WO 6 content from 0% to 4% wt., while indirect band gap Eg 2 decreased from 4.1 eV to 2.89 eV. Conversely, the PVB + 4% Bi 2 WO 6 nanocomposite increased Urbach’s energy (E U ) from 1.00 eV for pure PVB to 1.97 eV. Moreover, our research has documented the impact of different concentrations of Bi 2 WO 6 on a range of optical properties, including the refractive index ( n), extinction coefficient ( k), and other pertinent parameters. Utilizing the real and imaginary components of the dielectric constants ε r and ε i , an investigation was carried out into the dielectrics’ behavior and the optoelectrical parameters’ calculation. Furthermore, investigations were performed on the linear optical susceptibility, the non-linear refractive index, and the third-order non-linear optical susceptibility concerning the concentrations of Bi 2 WO 6 . In addition, the results indicated that varying Bi 2 WO 6 concentrations substantially affect the oscillator strength, average oscillator wavelength, and optical conductivity. The nanocomposite films of PVB/Bi 2 WO 6 concentrations exhibited favorable associations between their optoelectrical and non-linear/linear optical parameters, rendering them viable candidates for implementation in flexible electronic devices and radiation shielding.

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