Structural and optical characterizations of synthesized CMC/PVP-SnO2 nano composites

In this work, using tin chloride and citric acid in an aqueous solution as starting material, and a sol-gel method to synthesis SnO2 nanoparticles, so that SnO2 nanoparticles can be synthesized without complicated equipment or toxic and expensive solvents. The structural and optical characterizations of CMC/PVP doped SnO2 nanoparticles films were investigated. The CMC/PVP polymeric blend films were doped with different ratios of SnO2 nanoparticles (0, 2%, 4%, and 6%) using solvent casting technique with thickness 25±1 µm. The obtained results demonstrated that the optical transmittance (%) recorded at the wavelength range 190-1100 nm, and the increasing the SnO2 doping content led to the lowered percentage of transmittance for all samples The optical parameters of the prepared films were affected by the doping ratio as the films showed indirect allowed interband transitions. The band gap value of doped films decreased from 4.32 Ev to 3.92 eV as the doping ratios increases.