Efficient Detection of Trace Hg2+ in Water Based on the Fluorescence Quenching of Environment-friendly Thiolfunctionalized Poly(vinyl alcohol) Capped CdS Quantum Dots Nanocomposite
| Autor: | Ziqiang Lei, Xiaolin Guan, Hongting Fan, Yang Zhang, Donghai Zhang, Tianming Jia, Shoujun Lai |
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| Rok vydání: | 2016 |
| Předmět: |
Vinyl alcohol
Aqueous solution Metal ions in aqueous solution Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Analytical Chemistry Nanomaterials chemistry.chemical_compound chemistry Quantum dot 0210 nano-technology Luminescence |
| Zdroj: | Analytical Sciences. 32:161-165 |
| ISSN: | 1348-2246 0910-6340 |
| DOI: | 10.2116/analsci.32.161 |
| Popis: | Using environment-friendly materials for sensing toxic metal ions has drawn significant attention in recent research. Herein, we present an aqueous synthesis of stable CdS quantum dots (QDs) using thiol-functionalized poly(vinyl alcohol) (PVA) as the unique capping ligand for the detection of trace Hg(2+) in environmental water samples. The CdS QDs with an average size of 3.3 nm had good water-solubility and favorable fluorescence with a quantum yield of 32.8% and a longer luminescence lifetime of 31.9 ns. The fluorescence intensity of QDs aqueous solution in the 520 nm wavelength was quenched upon the addition of Hg(2+). Under the optimal conditions, the ratio of the blank fluorescence intensity to the quenched fluorescence intensity was linearly proportional to the Hg(2+) concentration from 2 to 4000 nM with a detection limit of 1 nM. Also, many co-existing metal ions were not interfered with the detection of Hg(2+). This nanomaterial was successfully applied to the measurement of Hg(2+) in water samples. |
| Databáze: | OpenAIRE |
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