title: A facile and highly sensitive probe for Hg(II) based on metal-induced aggregation of ZnSe/ZnS quantum dots.
abstract: 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 Hg(2+) 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 Hg(2+) ions.
authors: State Key Laboratory of Fine Chemical, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
authors: Jun
authors: J
authors: Ke
authors: Xinyong
authors: X
authors: Li
authors: Yong
authors: Y
authors: Shi
authors: Qidong
authors: Q
authors: Zhao
authors: Xuchuan
authors: X
authors: Jiang
mesh_terms: D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D008670:Metals / Q000737:chemistry; D019301:Oleic Acid / Q000737:chemistry; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013440:Sulfides / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D007477:Ions; D008670:Metals; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; D019301:Oleic Acid; D008628:Mercury; C031238:zinc sulfide; C044696:zinc selenide