Influence of Mn Doping on the Microstructure and Optical Properties of ZnS Nanocrystals
ZnS nanoparticles with Mn2+ doping (0–2.5%) were prepared through a simple chemical method. The nanostructures of the prepared undoped ZnS and Mn2+-doped ZnS:Mn nanoparticles had been characterized by X-ray power diffraction (XRD), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), photoluminescence spectra (PL) and UV–vis absorption spectra. The mean size of the particles was found to be approximately 3-5 nm through XRD measurements, TEM and the UV–vis absorption spectra. It was found that the Mn2+ 4T1→6A1 emission intensity of ZnS:Mn nanoparticles was significantly enhanced with the increase of Mn2+ concentration, which arrived a maximum value when Mn2+ initial doping concentration was 1.5%. Continue increasing the Mn2+ concentration, namely more than 1.5%, the Mn2+ 4T1→6A1 emission intensity became weakened. And the resultant ZnS:Mn nanoparticles exhibited high efficiency for degrading methylene blue under UV light irradiation.
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
H. M. Wang et al., "Influence of Mn Doping on the Microstructure and Optical Properties of ZnS Nanocrystals", Advanced Materials Research, Vols. 189-193, pp. 1169-1175, 2011