Citation: Xi Li-Li, Ma Hong-Bing, Tao Guan-Hong. Thiourea functionalized CdSe/CdS quantum dots as a fluorescent sensor for mercury ion detection[J]. Chinese Chemical Letters, ;2016, 27(9): 1531-1536. doi: 10.1016/j.cclet.2016.03.002 shu

Thiourea functionalized CdSe/CdS quantum dots as a fluorescent sensor for mercury ion detection

a.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
b.
Analytical and Testing Center, Soochow University, Suzhou 215123, China

Corresponding author: Tao Guan-Hong, taogh@suda.edu.cn
Received Date: 25 January 2016
Revised Date: 23 February 2016
Accepted Date: 1 March 2016
Available Online: 3 September 2016

Figures(9)

CdSe/CdS quantum dots (QDs) functionalized by thiourea (TU) were synthesized and used as a fluorescent sensor for mercury ion detection. The TU-functionalized QDs were prepared by bonding TU via electrostatic interaction to the core/shell CdSe/CdS QDs after capping with thioglycolic acid (TGA). It was observed that the fluorescence of the functionalized QDs was quenched upon the addition of Hg²⁺. The quantitative detection of Hg²⁺ with this fluorescent sensor could be conducted based on the linear relationship between the extent of quenching and the concentration of Hg²⁺ added in the range of 1-300 mg L^-1. A detection limit of 0.56 mg L^-1 was achieved. The sensor showed superior selectivity for Hg²⁺ and was successfully applied to the determination of mercury in environmental samples with satisfactory results.
- Quantum dots,
- Fluorescent sensor,
- Thiourea,
- Quenching,
- Mercury ion,
- Detection
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