Abstract
Lithium ions-doped polyvinyl alcohol/polyvinyl pyrrolidone (PVA/PVP) films were prepared by solution casting technique and exposed to 100 kGy gamma radiation. The structural modifications in the samples before and after irradiation were studied using X-ray diffraction XRD and UV–Vis spectroscopy. The results indicated that absorbance $$ A\,(\lambda ) $$ and absorption index (k) increased, while semicrystalline nature of the blend decreased due to the addition of Li2SO4 and irradiation. The optical band gap $$ E_{\text{g}}^{\text{opt}} $$ of the composites showed significant decrease from 2.98 to 2.196 eV by adding Li2SO4 and from 2.83 to 2.08 eV after irradiation due to cross-linking. The Tauc’s relation indicated that allowed transitions are indirect for both irradiated and unirradiated samples. The Urbach energy ( $$ E_{\text{u}} $$ ) increased with increasing Li ion content and exposure to γ irradiation. The dependence of dielectric permittivity $$ \varepsilon_{1} $$ , dielectric loss $$ \varepsilon_{2} $$ and optical conductivity $$ \sigma_{opt} $$ on photon energy $$ h\nu $$ was also studied.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
