Effect of Cu doping on structural and optical properties of CdS nanoparticles

Abstract

Undoped and Cu doped CdS nanoparticles were synthesized in aqueous solution by chemical coprecipitation method using EDTA as a capping agent. As synthesized samples were characterized by X-ray diffraction (XRD), energy dispersive analysis of X-rays (EDAX), diffuse reflectance spectra (DRS). X-ray diffraction (XRD) analysis reveals that undoped CdS nanoparticles are in cubic phase, where as Cu doped CdS nanoparticles are in mixed phase of cubic and hexagonal. EDAX spectra confirmed the presence of Cu in the samples with expected stoichiometric composition. DRS and corresponding Kubelka-Munk plots reveal that the band gap is narrowing with Cu doping.