Effects of Ultraviolet Light on Optical Properties of Colloidal CdS Nanoparticles Embedded in Polyvinyl Alcohol (PVA) Matrix

摘要

CdS nanoparticles have been synthesized in aqueous solution using polyvinyl alcohol (PVA) as a cappingreagent. The effects of exposure by ultraviolet (UV) light on optical properties of nanocomposites consistingof colloidal CdS nanoparticles and a polymer PVA matrix were studied by employing photoluminescence (PL)spectroscopy. It is shown that UV-induced changes of the photoluminescence intensity in PVA are caused bycreation and healing of non-radiative recombination centers. It is also concluded that in the nanocomposites,the UV-induced changes of the PL intensity are predominantly governed by processes at the NP/PVA interface