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- Title
Alginate capped and manganese doped ZnS quantum dots as a phosphorescent probe for time-resolved detection of copper(II).
- Authors
Zou, Wen-Sheng; Deng, Ming-Yue; Wang, Ya-Qin; Zhao, Xiaoli; Li, Wei-Hua; Huang, Xian-Huai
- Abstract
A method is described for the detection of Cu(II). It is based on the use of a room-temperature phosphorescent probe consisting of alginate-capped and manganese(II)-doped ZnS quantum dots. The carboxy groups at the surface of the probe strongly coordinate Cu(II) to form a complex. As a result, the 4T1-6A1 transition of the Mn(II) ions in the probe is quenched, and the long decay time (~2.1 ms in the unquenched state) is accordingly reduced. At excitation/emission wavelengths of 316/590 nm and a delay time of 0.1 ms, the probe shows a linear response in the 0.01 to 12 μM Cu(II) concentration range. The detection limit is 6.0 nM and the RSD is 3.2% (for n = 5).A two-step procedure is described to synthesize alginate capped manganese doped ZnS QDs. These coordinate with Cu(II) to form an absorbent complex and can be used as a phosphorescent probe for time-resolved detection of Cu(II).
- Subjects
ALGINIC acid; MANGANESE compounds; ZINC sulfide; QUANTUM dots; PHOSPHORESCENCE; COPPER compounds; METAL detectors
- Publication
Microchimica Acta, 2019, Vol 186, Issue 1, p1
- ISSN
0026-3672
- Publication type
Article
- DOI
10.1007/s00604-018-3165-z