Preparation, structural and linear optical properties of Zn doped CdS nanopowders

• Published in: IOP conference series. Materials Science and Engineering Vol. 73; no. 1; p. 12079
• Main Authors: Sekhar, H, Kumar, Y Rakesh, Rao, D Narayana
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.01.2015
• Subjects: Acetates; Cadmium; Cadmium sulfide; Coprecipitation; Doping; Emission; Excitation; Excitons; Lattice parameters; Nanostructure; Optical properties; Phase shift; Phase transitions; Phonons; Photoluminescence; Room temperature
• ISSN: 1757-899X; 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/73/1/012079

A series of Zn doped cadmium sulfide (CdS:Zn) nanopowders were prepared by a simple co-precipitation method at room temperature by mixing the stoichiometric amount of reactants in a Milli Q water solvent. The composition of nanopowders was accurately adjusted by controlling the molar ratio of Cd, Zn acetate in the mixed reactants. Spectroscopic studies on as prepared nanopowders were investigated by using XRD, Raman, UV-Vis absorption, FE- SEM-EDAX and photoluminescence. Extremely broad reflections of XRD peaks of as prepared powders establish the nanometer scale dimensions and cubic structure. Doping with Zn in CdS does not lead to any structural phase transformation but introduces a decrease in the lattice constants. Two characteristics of LO phonon peaks were observed in pure and Zn doped CdS samples. Raman peaks of Zn doped CdS nanopowders shifts slightly towards higher energy side compared to the pure CdS nanopowders. Exciton-phonon confinement factor (S) varies in between 0.3-0.4. At lower wavelength excitation we observed a broad emission peak maximum centered at 404 nm is attributed to localized band edge emission.