title: A near-infrared-emitting CdTe/CdS core/shell quantum dots-based OFF-ON fluorescence sensor for highly selective and sensitive detection of Cd2+.
abstract: A near-infrared-emitting CdTe/CdS core/shell quantum dots (QDs)-based photoluminescence (PL) sensor was designed and applied for highly selective and sensitive detection of Cd(2+). This sensor was based on a PL "OFF-ON" mode. First, the addition of ammonium pyrrolidine dithiocarbamate (APDC) led to remarked PL quenching of QDs. Second, PL of APDC surface modified QDs (QDs-APDC) was gradually restored with the each increment of Cd(2+) concentration. Experimental results showed that PL of QDs-APDC was near proportional upon the addition of Cd(2+) in the range from 0.1 to 2 μM with a good correlation coefficient of 0.9989. The limit of detection of this proposed method was 6 nM. Interferential experiments confirmed that this sensor of Cd(2+) was highly selective over other metal ions. To further investigate perfect analysis performance, this sensor was favorably utilized to determine Cd(2+) in tap water, river water and liposome solutions.
authors.affiliation: Department of Physical Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, PR China. jacky_0538@163.com
authors.forename: Rijun
authors.initials: R
authors.lastname: Gui
authors.forename: Xueqin
authors.initials: X
authors.lastname: An
authors.forename: Hongjuan
authors.initials: H
authors.lastname: Su
authors.forename: Weiguo
authors.initials: W
authors.lastname: Shen
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Chen
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Wang
mesh_terms: D002104:Cadmium / Q000032:analysis* / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes; D005618:Fresh Water / Q000737:chemistry*; D006801:Humans; D057230:Limit of Detection; D011759:Pyrrolidines / Q000737:chemistry; D045663:Quantum Dots; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013440:Sulfides / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*; D013859:Thiocarbamates / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005456:Fluorescent Dyes; D011759:Pyrrolidines; D012996:Solutions; D013440:Sulfides; D013859:Thiocarbamates; D014874:Water Pollutants, Chemical; D002104:Cadmium; C020972:pyrrolidine dithiocarbamic acid; D013691:Tellurium