期刊
RSC ADVANCES
卷 7, 期 5, 页码 2810-2816出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra25465a
关键词
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资金
- National Natural Science Funds for Distinguished Young Scholars [51425306]
- National Key Research and Development Program of China [2016YFA0202302]
- State Key Program of National Natural Science Foundation of China [51633007]
- National Natural Science Foundation of China [51373116, 51573125, 513111129]
Hydroxyl functionalized carbon dots (H-CDs) were prepared by monoesterification of ethylene glycol. The H-CDs exhibit a narrow size distribution of 1-4 nm and enhanced photoluminescent (PL) intensity due to an increased amount of electron donor hydroxyl groups. According to fluorescence spectra, the H-CDs exhibit a high sensitivity to Fe3+ with a detection limit of 2.56 nM, which is superior to the detection limit of CDs (7.4 mu M). The quenching fluorescence is primarily controlled by the formation of a chelate compound based on the complexation between Fe3+ and the hydroxyl on the surface of the H-CDs. Furthermore, we demonstrate that paper impregnated with H-CDs exhibits a high sensitivity to Fe3+ by fluorescence quenching. In the future, the modified CDs can be developed for high sensitivity fluorescent probes by optimizing the chemical structures and microstructures.
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