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论文类型：期刊论文

发表时间：2012-08-21

发表刊物：NANOSCALE

收录刊物：SCIE、EI、PubMed、Scopus

卷号：4

期号：16

页面范围：4996-5001

ISSN号：2040-3364

摘要：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.