Journal
TALANTA
Volume 78, Issue 2, Pages 364-369Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2008.11.025
Keywords
CdSe QDs; Triethanolamine; Mercury (II); Iodide; Quenching
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Funding
- National Natural Science Foundation of China [20475035]
- Natural Science Foundation of Shanxi Province [2008011015-1]
- Undergraduate Foundation of Taiyuan City
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Water-soluble luminescent CdSe quantum dots surface-modified with triethanolamine (TEA-CdSe-QDs) were prepared with high stability. The fluorescence of the TEA-CdSe-QDs was greatly quenched only when Hg2+ and I- coexisted in the solution, whereas addition of either Hg2+ or I- individually has no noticeable effect on the fluorescence emission. Such a unique quenching effect could be used for reciprocal recognition of mercury (II) ions and/or iodide anions in aqueous solution with rather high selectivity and sensitivity. The detection limits of Hg2+ or I- ion were 1.9 x 10(-7) mol L-1 or 2.8 x 10(-7) mol L-1, respectively. The adequate experiments showed that iodine (I) anions could bridge between TEA-CdSe-QDs and Hg2+ to form a stable complex (QDs-I--Hg2+) and the following effective electron transfer from the QDs to the Hg2+ could be responsible for the fluorescence quenching of QDs. (c) 2008 Elsevier B.V. All rights reserved.
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