Synthesis, structural and photocatalytic studies of Mn-doped CdS nanoparticles

摘要

Mn-doped CdS nanoparticles (Cd_(1-x) Mn _x S; where x = 0.00-0.10) were synthesized by a chemical precipitation method. The synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscope (TEM), and UV-Vis spectrometer. The XRD and TEM measurements show that the size of crystallites is in the range of 10-40 nm. Optical measurements indicated a red shift in the absorption band edge upon Mn doping. The direct allowed band gaps of undoped and Mn-doped CdS nanoparticles measured by UV-Vis spectrometer were 2.3 and 2.4 eV at 400 C, respectively. Photocatalytic activities of CdS and Mn-doped CdS were evaluated by irradiating the solution to ultraviolet light and taking methyl orange (MO) as organic dye. It was found that 5 mol% Mn-doped CdS bleaches MO much faster than undoped CdS upon its exposure to the ultraviolet light. The experiment demonstrated that the photo-degradation efficiency of 5 mol% Mn-doped CdS was significantly higher than that of undoped CdS.