期刊
TALANTA
卷 85, 期 4, 页码 1738-1743出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.06.071
关键词
Zinc sulfide; Quantum dots; Sensors; Fluorescence; Mercury ions; Nanoparticles
资金
- National Natural Science Foundation of China (NSFC) [50972083, 21075077]
- Independent Innovation Foundation of Shandong University [IIFSDU-2009JQ011]
- Chinese Ministry of Education [109098]
- National Basic Research Program of China (973 Program) [2007CB936602]
- Shandong Provincial Natural Science Foundation for Distinguished Young Scholar [JQ201004]
This paper described an investigation of a novel eco-friendly fluorescence sensor for Hg2+ ions based on N-acetyl-L-cysteine (NAC)-capped ZnS quantum dots (QDs) in aqueous solution. By using safe and low-cost materials, ZnS QDs modified by NAC were easily synthesized in aqueous medium via a one-step method. The quantitative detection of Hg2+ ions was developed based on fluorescence quenching of ZnS QDs with high sensitivity and selectivity. Under optimal conditions, its response was linearly proportional to the concentration of Hg2+ ions in a range from 0 to 2.4 x 10(-6) mol L-1 with a detection limit of 5.0 x 10(-6) mol L-1. Most of common physiologically relevant cations and anions did not interfere with the detection of Hg2+. The proposed method was applied to the trace determination of Hg2+ ions in water samples. The possible quenching mechanism was also examined by fluorescence and UV-vis absorption spectra. (C) 2011 Elsevier B.V. All rights reserved.
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