Synthesis and Characterization of CdS Nanoparticles Obtained in Star-Like Dextran-Graft-Polyacrylamide Matrices

Abstract

Cadmium sulfide (CdS) nanoparticles (NPs) are synthesized into a branched dextran-graftpolyacrylamide matrix. The obtained stable sol is characterized by spectrophotometry, fluorescence spectroscopy, transmission electron microscopy, and dynamic light scattering. The polymer affects the process of the nanoparticle formation, namely controls their size and morphology, and enhances the sols storage stability preventing the nanoparticles aggregation. It is shown that CdS NPs obtained in a branched polymer matrix are monodisperse 4-6 nm in size and form clusters (50-200 nm in size) localized in a limited macromolecule volume. The CdS nanoparticles reveal the improved blue light emission and may be considered as a promising material for light-emitting devices, especially in the blue region. They may have potential applications as biological labels.