Journal
ANALYST
Volume 138, Issue 7, Pages 2181-2191Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3an36742h
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Funding
- Natural Science Foundation of China [21175043]
- Fundamental Research Funds for the Central Universities
- National Innovation Experiment Program for University Students [111025119]
- Chenguang Program of the Shanghai Education Commission [11CG31]
- Fujian Provincial Key Laboratory of Nanomaterials [NM10-06]
- Program for Professor of Special Appointment at Shanghai Institutions of Higher Learning
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Since zinc ions play an important role in various physiological activities, developing a facile detection method for Zn2+ is highly desirable. Owing to their superior optical properties, semiconductor quantum dots (QDs) have been developed as a promising alternative for organic fluorophores in fluorescence analysis. In this study, water soluble di-2-picolylamine-dithiolcarbamate (DPA-DTC)/proline-dithiolcarbamate (P-DTC) co-capped CdSe/ZnS QDs as a sensitive and selective turn-on fluorescence probe for Zn2+ was reported. The probe was easily obtained via ligand exchange. The initial bright fluorescence of QDs was effectively quenched by DPA-DTC that acted as an effective hole trapper. Upon complexation with Zn2+, the formation of Zn2+-DPA-DTC complex altered the energetic position of the HOMO for DPA-DTC, which rendered it unfavorable for the hole transfer. Thus the QDs PL was switched on. Under optimal conditions, a good linear relationship between the fluorescence response and Zn2+ concentration could be obtained in the range from 0.9 to 16 mu M. The limit of detection for Zn2+ was found to be 0.7 mu M. Furthermore, the present probe exhibited a high selectivity for Zn2+ over other common metal ions and was successfully used in the detection of Zn2+ in simulated biological fluids.
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