Synthesis and characterization of Cd1−xZnxS nanopowder and its nanostructured thin films
Departement of Physics, Golestan
Received in final form: 9 November 2013
Published online: 18 March 2014
Cd1−xZnxS (with x = 0, 0.01, 0.03, 0.05 and 0.1) nanopowder were synthesized by chemical precipitation method under N2 atmosphere at room temperature. Cd1−xZnxS nanostructured thin films were deposited on the glass at 450 °C by spraying the colloidal suspension of the Cd1−xZnxS nanoparticles. Optical and structural properties of both nanostructures were investigated. The prominent peaks of X-ray diffractions (XRD) of samples indicate that the Cd1−xZnxS crystalline grain size in the nanostructured thin film is larger than the Cd1−xZnxS nanoparticles in the nanopowder, due to growing of the grains, originated from high temperature of the substrate. UV-Vis absorption spectra show that both Cd1−xZnxS nanostructures have smaller band edge wavelength in comparison with bulk samples. There is also an increase in blue shift value of the band gap of both Cd1−xZnxS nanostructures, with increasing x, which can be attributed to Burstein-Moss effect. It was found that the variation of the band gap of ZnxCd1−xS nanopowder and nanostructured thin films with Zn concentration are approximately linear with similar slopes. Photoluminescence (PL) spectra indicated that the emission peaks of both the samples are shifted toward the shorter wavelengths with increasing Zn+2 ions.
Key words: Clusters and Nanostructures
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2014