The Effects of Additive TiO₂ Nanoparticles on the Energy Gap of DCM Doped with PS Thin Films

Abstract

In this work thin films containing laser dye (DCM) doped with polystyrene (PS) were prepared using casting method. Titania (TiO2) nanoparticles also were synthesized using sol gel technique. Characteristics of the tetania were done using XRD patter, and the characteristic peak of anatase is sharper and clear to observe, in particular at 25.40° degree. While scanning electron microscopy (SEM) was used to achieve the morphology of TiO2 samples, and to determine the sizes of nanoparticles. Different titania nanoparticle densities (0.882×1020, 1.765×1020, 2.648×1020, 3.530×1020 and 4.413×1020cm-3) were co-doping with dye doped polymer and study the effect of this addition on the optical properties and electronic transition energy gaps in cases of both direct and indirect transitions.