Journal
RSC ADVANCES
Volume 12, Issue 46, Pages 30113-30119Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra05167b
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Funding
- National Natural Science Foundation of China [61901405]
- Excellent Talents Scientific Research Project [D2019026]
- General Project of Natural Science of Jiangsu Province [BK20221215]
- Medical and Health Guidance Plan Project of Wuxi Science and Technology Development [NZ2019048]
- China Postdoctoral Science Foundation [2020M671608]
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In this study, a sensitive ratiometric fluorescent nanosensor was developed by encapsulating carbon dots and cadmium telluride quantum dots into a metal-organic framework. This nanosensor exhibited high sensitivity and selectivity towards silver ions, and was successfully applied for the determination of Ag+ in lake water.
In this study, a sensitive ratiometric fluorescent nanosensor was constructed using a facile one-pot method by encapsulating carbon dots (CDs) and cadmium telluride quantum dots (CdTe QDs) into the pore cavities of a metal-organic framework (ZIF-8). In this nanosensor (CD/CdTe QD@ZIF-8), the fluorescence attributed to CdTe QDs was quenched by silver ions (Ag+), and the fluorescence intensity of CDs did not change. The introduction of ZIF-8 into the system can not only adsorb Ag+ but also easily separate CDs and CdTe QDs from the matrix. The developed CD/CdTe QD@ZIF-8 composite used as a ratiometric fluorescent probe exhibited high sensitivity and selectivity towards Ag+. The working linear range was 0.1-20 mu M with a limit of detection (LOD) of 1.49 nM. Finally, the proposed nanosensor was applied to determine Ag+ in lake water with satisfactory results.
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