Journal
RSC ADVANCES
Volume 9, Issue 66, Pages 38568-38575Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra07030c
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Funding
- National Natural Science Foundation of China [21301111, 51602322]
- Shanxi Scholarship Council of China [2016-105]
- Research Foundation of Datong City [2019027, 2017129]
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In this study, dual-emission carbon dots (D-CDs) are synthesized via a simple one-step solvothermal treatment of red tea. The obtained D-CDs are characterized by XPS, IR, TEM, XRD, fluorescence and UV-vis spectroscopy techniques. It is found that D-CDs present a strong red fluorescence emission peak at 671 nm and weak blue fluorescence emission peak at 478 nm under the excitation wavelength of 410 nm. The unique dual-emission properties of D-CDs provide great opportunities in ratiometric fluorescence sensing applications. The results show that Cu2+ ions can quench the fluorescence of the red emission band of D-CDs effectively, resulting in the disappearance of red fluorescence ultimately. Upon the addition of Al3+ ions, the fluorescence of blue emission band at 478 nm grows apparently, and the fluorescence color transforms gradually from red to orange, then to yellow-green. Based on these findings, a novel ratiometric fluorescence and colorimetric dual mode nanosensor is developed for simultaneous detection of Cu2+ and Al3+ ions. Regarding Cu2+ ions, the fluorescent detection linear range is 0.1-50 mu M with detection limit of 0.1 mu M, and the colorimetric detection limit is estimated as 25 mu M. With regard to Al3+ ions, the fluorescent detection linear range is 0-20 mu M and 25-100 mu M with detection limit of 0.5 mu M, and the colorimetric detection limit is 20 mu M. Furthermore, the fluorescence response mechanisms of Cu2+ and Al3+ ions were discussed detailed. To the best of our current knowledge, this will be the first research work on the simultaneous determination of Cu2+ and Al3+ using D-CDs as fluorescent probes.
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