title: Dithizone functionalized CdSe/CdS quantum dots as turn-on fluorescent probe for ultrasensitive detection of lead ion.
abstract: An ultrasensitive fluorescent probe is developed for the determination of lead ion by utilizing dithizone (Dz) functionalized CdSe/CdS quantum dots (QDs). Dithizone was bound to the QDs via a surface coordinating reaction to form QDs-Dz conjugates and quench fluorescence of the QDs by fluorescence resonance energy transfer (FRET) mechanism. Upon the addition of Pb(2+), a dramatic enhancement of the fluorescence intensity was observed, which resulted from the FRET pathway shutting off, and hence the fluorescence of the QDs was recovered. Two successive linear ranges of 0.01-1000 nmol L(-1) and 1-20 μmol L(-1) allow a very wide determination of Pb(2+) concentration from 0.01 nmol L(-1) to 20 μmol L(-1), with a detection limit of 0.006 nmol L(-1). The fluorescent probe was successfully applied to the determination of lead in environmental samples with satisfactory results.
authors: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China.
authors: Qin
authors: Q
authors: Zhao
authors: Xiaolong
authors: X
authors: Rong
authors: Hongbing
authors: H
authors: Ma
authors: Guanhong
authors: G
authors: Tao
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D004230:Dithizone / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D031541:Fluorescence Resonance Energy Transfer; D005456:Fluorescent Dyes / Q000737:chemistry*; D007477:Ions; D007854:Lead / Q000737:chemistry; D016014:Linear Models; D045663:Quantum Dots; D015203:Reproducibility of Results; D018036:Selenium Compounds / Q000737:chemistry*; D012995:Solubility; D013050:Spectrometry, Fluorescence; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D007477:Ions; D018036:Selenium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D007854:Lead; D004230:Dithizone; C058667:cadmium selenide