Abstract
Undoped and doped polycarbonate (PC) polymer nanocomposites with nano tin disulfide (SnS2) were synthesized by the thermolysis and casting methods. The effect of nano SnS2 doping on the absorption behavior of polycarbonate nanocomposites was studied in details using Fourier transform infrared spectroscopy technique. Structural analysis for undoped and doped films was investigated using X-ray diffraction technique. Detailed absorption measurements were performed in the wavelength range of 200-800 nm using UV spectroscopy technique. Results showed that our nanocomposites films exhibited a direct optical energy gap that decreased from 4.68 to 4.32 eV with the increment of the doping concentration up to 5 wt%. The optical constants of polymer nanocomposites such as absorption coefficient, extinction coefficient, refractive index, dielectric constant, average oscillator strength and wavelength revealed an enhancement in the optical values of polymer nanocomposites compared with undoped polymer. The improvement in the refractive index values with the doping content revealed the uniform distribution of the nanoparticles within the PC matrix. Scanning electron microscope images confirmed these results. Wemple-Didomenico single oscillator model was applied in order to examine different dispersion parameters such as single-oscillator and dispersion energies, the high frequency dielectric constant and the ratio of free charge carrier amount to the effective mass. The resulting improvements in the optical properties of the inspected polymer nanocomposites referred to the possibility of future usage as UV blocking materials in the industry such as contact lenses and optoelectronic devices.