Studying Doping Effect on Structural, Linear and Nonlinear Properties of PVA/PbS Nanocomposites

Abstract

Tuning the nanoparticle features by doping iron impurities is an interesting field. It provides a tool for structural and optical characteristics controlling for the material. PVA/PbS nanoparticles synthesized by chemical bath route in the presence of PVA polymer as jell bed stabilizer them Sn and Ag ions injected in material as impurities. Prepared samples investigated by XRD and TEM for criticality and morphology proofing, which were in agreement with each other. Optical spectroscopy of nanocomposites studied by Uv-Vis (300-900 nm) range absorption spectra and by using tach relation bandgap of samples was measured that was a semiconductor (around 2.3-2.8 eV). Studying followed by photoluminescence spectroscopy (PL), we saw in this case for both impurities PL quenched by doping. Nonlinear measurements were done by Z-scan technique with a He-Ne CW laser by 632.8 nm wavelength beam focused by 150mm focal length lens was used for exciting samples which led to thermal nonlinearity mechanism. For nonlinear refractive index and nonlinear absorption, self-focusing and saturable absorber attribute were observed respectively. n2 and β were from the order of 10-9 and 10-3, respectively.