| Autor: |
Xiaolin, Guan, Hongting, Fan, Yang, Zhang, Donghai, Zhang, Tianming, Jia, Shoujun, Lai, Ziqiang, Lei |
| Rok vydání: |
2016 |
| Zdroj: |
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry. 32(2) |
| ISSN: |
1348-2246 |
| 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 |
| Externí odkaz: |
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