Improvement of the optical characteristics of PVA/PVP blend with different concentrations of SnS2/Fe

Polyvinyl alcohol (PVA)/polyvinylpyrrolidone (PVP; weight 7:3) polymer blends doped with different ratios (1 wt%, 3 wt%, 5 wt%, and 10 wt%) from nano SnS2/Fe are developed using casting and thermolysis procedures. Rietveld analysis showed that Fe is incorporated into the SnS2 lattice forming a single hexagonal phase with an average crystallite size of 6 nm along [00l] direction and 15 nm along [h00] direction. X-ray diffraction together with Fourier transform infrared data is used to examine the homogeneity distribution of the nanofiller over the blend matrix. The effect of doping on the absorbance, transmittance, extinction coefficient, refractive index, direct and indirect optical band gaps, and other dispersion parameters of the blend is studied in detail. The nature of electronic transitions in the different blends was determined using Tauc's relation and the dielectric loss parameter. As the weight concentrations of SnS2/Fe dopants increased, the nonlinear optical parameters are increased relative to the undoped PVA/PVP polymer blend. The influence of the different excitation wavelengths and the amount of nanofillers on the fluorescence spectra from different blends are also investigated.