Dithizone functionalized CdSe/CdS quantum dots as turn-on fluorescent probe for ultrasensitive detection of lead ion

Qin Zhao^{a, b}, Xiaolong Rong^a, Hongbing Ma^c, Guanhong Tao^a, （陶冠红）

^a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China

^b School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China

^c Analytical and Testing Center, Soochow University, Suzhou, Jiangsu 215123, China

J. Hazard. Mater. 2013, 250, 45–52.

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 Pb²⁺, 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 Pb²⁺ 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.

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