The effect of concentration of nano CdS/Fe prepared under different conditions on the structural, optical absorption and linear/nonlinear parameters of PVA/PVP polymer blend

Iron doped cadmium sulfiede (Cd0.9Fe0.1S) was prepared using a thermolysis procedure in air and under the flow of nitrogen. 50%PVA/50%PVP polymer blends doped with different contents of CdS/Fe (1, 3, 5, 10 wt%) were formed using the casting procedure. The effect of preparation atmosphere on the formed phases and the crystallinity was investigated using Rietveld method. The possibility of integration of the nanofiller CdS/Fe with a different percentage in the blend matrix was also studied using X-ray diffraction technique. The effect of preparation conditions of the nanofiller and its concentrations on the absorbance behavior, extinction coefficient, optical conductivity and band gaps of the blend samples was explored in detail. The refractive index value of PVA/PVP blend was increased from 1.05 to 1.19 or 1.2 as it doped with 10% CdS/Fe (air) or CdS/Fe (N2), respectively. The nonlinear parameters for the PVA/PVP/CdS/Fe (N2) have nearly fixed values over a wide range of wavelengths. The fluorescence intensity for the PVA/PVP blend was increased as it was doped with 3% CdS/Fe (air) only. The emitted colors from the blends depended on the excitation wavelength, kind and amount of the nanofiller. •Cd0.9Fe0.1S sample prepared under N2 in the air or under N2 flows.•The absorbance and σopt of samples doped with CdS/Fe (air) are higher than that of sample doped with the same amount of CdS/Fe(N2).•The rates of reduction in the direct and indirect optical band gaps of the blend doped with CdS/Fe (air) are higher than the blended polymers doped with CdS/Fe (N2).•The nonlinear parameters for the PVA/PVP/CdS/Fe (N2) have nearly fixed values over a wide range of wavelengths.•The fluorescence intensity for the PVA/PVP blend was increased as it was doped with 3% CdS/Fe (air) only.