title: Phosphorescence detection of manganese(VII) based on Mn-doped ZnS quantum dots.
abstract: The phosphorescent l-cysteine modified manganese-doped zinc sulfide quantum dots (l-cys-MnZnS QDs) was developed for a highly sensitive detection of permanganate anions (MnO4-). l-cys-MnZnS QDs, which were easily synthesized in aqueous media using safe and low-cost materials, can emit intense phosphorescence even though the solution was not deoxygenated. However, the phosphorescence of l-cys-Mn-ZnS QDs was strongly quenched by MnO4-ascribed to the oxidation of l-cys and the increase of surface defects on l-cys-MnZnS QDs. Under the optimal conditions, l-cys-MnZnS QDs offer high selectivity over other anions for MnO4-determination, and good linear Stern-Volmer equation was obtained for MnO4-in the range of 0.5-100μM with a detection limit down to 0.24μM. The developed method was finally applied to the detection of MnO4-in water samples, and the spike-recoveries fell in the range of 95-106%.
authors: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China.
authors: Pan
authors: P
authors: Deng
authors: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China. Electronic address: llqdick@cug.edu.cn.
authors: Li-Qiang
authors: LQ
authors: Lu
authors: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China.
authors: Wei-Cheng
authors: WC
authors: Cao
authors: Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geoscience, Wuhan 430074, PR China.
authors: Xi-Ke
authors: XK
authors: Tian
keywords: Permanganate anions; Phosphorescence; Zinc sulfide quantum dots