Phosphorescence detection of manganese(VII) based on Mn-doped ZnS quantum dots.

Author(s) Deng, P.; Lu, L.Q.; Cao, W.C.; Tian, X.K.
Journal Spectrochim Acta A Mol Biomol Spectrosc
Date Published 2017 Feb 15

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%.

DOI 10.1016/j.saa.2016.10.032
ISSN 1873-3557
Citation Spectrochim Acta A Mol Biomol Spectrosc. 2017;173:578583.

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