Optical properties of incorporating of ZnO nano-particles on the dopant poly(o-toluidine)

Abstract This work submit a study of the optical characteristic and EDX of nano ZnO/poly (o-toluidine) (POT) doping with organic acids dodecylbenzene sulfonate acid (DBSA) composites were synthesized by in-situ chemical oxidative polymerization method of (o-toluidine) monomer in existence of different ZnO nanoparticles concentration (weight ratio OT/ZnO:1/0.05, 1/0.1, 1/0.15), the products were washed by the centrifugation method, in order to avoid a higher loss of ZnO. Those POT-DBSA/ZnO composite films were intended by spin coating procedure. The optical properties of the prepared films were examined by Fourier transform infrared (FT-IR), UV–Visible. The structural properties of composite films were tested by energy-dispersive X-ray spectroscopy (EDX). The results of the FTIR indicate that ZnO were successfully embedded in the POT via chemical interactions between ZnO and OT monomer. The results of UV–Visible showed a sharp increase in the band gap from (2.55to2.68) eV with increasing the percentage ratio of ZnO nanoparticles in POT-DBSA matrix. The EDX spectrum showed the presence of element Zn in POT-DBSA/ZnO composites, it is absent in POT-DBSA, which was consistent with the results FTIR.