Journal
LANGMUIR
Volume 34, Issue 26, Pages 7767-7775Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b00947
Keywords
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Funding
- National key research and development program of China [2016YFB0401701]
- National Science Foundation of China (NSFC) [51433003, 21774041]
- JLU Science and Technology Innovative Research Team [2017TD-06]
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Zn2+-passivated carbon dots (named Z-CDs) were synthesized from zinc gluconate for the first time through a one-step pyrolysis treatment. The mechanism of Zn2+-enhanced fluorescence was carefully investigated, and a new strategy to passivate the surfaces of CDs by Zn2+ was proposed. Inspired by the complexation reaction between Zn2+ and ethylenediaminetetraacetic acid (EDTA), a reversible off-on fluorescent nanosensor for the detection of EDTA and Zn2+ was constructed based on the depassivation and repassivation of Z-CDs, with a limit of detection as low as 3.2 x 10(-7) M and 5.1 x 10(-7) M, respectively. The proposed Z-CD-based nanosensor had been further utilized for EDTA and Zn2+ monitoring in tap water with excellent recovery. To the best of our knowledge, this was the first report of a fluorescence-based sensor of EDTA and a turn-on sensor of Zn2+ based on CDs with reversible detection capability. Also, benefiting from the low toxicity of zinc, Z-CDs were applied for multicolor bioimaging and in vitro detection in cells.
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