期刊
NANOSCALE
卷 4, 期 16, 页码 4996-5001出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr31238g
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资金
- National Nature Science Foundation of China [20877013, NSFC-RGC 21061160495]
- National High Technology Research and Development Program of China (863 Program) [2010AA064902]
- Major State Basic Research Development Program of China (973 Program) [2011CB936002]
- Excellent Talents Program of Liaoning Provincial University [LR2010090]
- Key Laboratory of Industrial Ecology and Environmental Engineering, China Ministry of Education
Sensitive and selective detection strategies for toxic heavy metal ions, which are rapid, cheap and applicable to environmental and biological fields, are of significant importance. As a result of specific interaction between thiol(s) used as ligands and heavy metal ions, the photoluminescence intensity of quantum dots (QDs) in PBS buffer solution was quenched and the aggregation of QDs was formed at the same time. Herein, we present water-soluble, low toxic QDs, ZnSe/ZnS, which were applied for ultrasensitive Hg2+ ion detection with a low detection limit (2.5 nM). In addition, a model has been proposed to explain the aggregation of QDs in the presence of heavy metal ions such as Hg2+ ions.
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