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Thiourea functionalized CdSe/CdS quantum dots as a fluorescent sensor for mercury ion detection 被引量:2

Thiourea functionalized CdSe/CdS quantum dots as a fluorescent sensor for mercury ion detection
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摘要 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 Hg^2+. The quantitative detection of Hg^2+ with this fluorescent sensor could be conducted based on the linear relationship between the extent of quenching and the concentration of Hg^2+ added in the range of 1-300 μg.L^-1, A detection limit of 0.56 μg.L^-1 was achieved. The sensor showed superior selectivity for Hg^2+ and was successfully applied to the determination of mercury in environmental samples with satisfactory results 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 Hg^2+. The quantitative detection of Hg^2+ with this fluorescent sensor could be conducted based on the linear relationship between the extent of quenching and the concentration of Hg^2+ added in the range of 1-300 μg.L^-1, A detection limit of 0.56 μg.L^-1 was achieved. The sensor showed superior selectivity for Hg^2+ and was successfully applied to the determination of mercury in environmental samples with satisfactory results
出处 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第9期1531-1536,共6页 中国化学快报(英文版)
基金 the financial support from the National Natural Science Foundation of China (Nos. 20345006 and 20575043)
关键词 Quantum dots Fluorescent sensor Thiourea Quenching Mercury ion Detection Quantum dots Fluorescent sensor Thiourea Quenching Mercury ion Detection
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