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Fluorescence probe based on boron-doped carbon quantum dots for high selectivity "on-off-on" mercury ion sensing and cell imaging.
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Sep2022, Vol. 648, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- Mercury ions (Hg2+) are recognized as the typical inorganic contamination that can cause severe damage to the environment and humans. In this paper, boron-doped carbon quantum dots (B-CQDs) with a fluorescence quantum yield (QY) of 10.4% and good photoluminescent properties were synthesized via a one-step hydrothermal method using citric acid and histidine as the carbon source and borax as the provider of boron. The obtained B-CQDs exhibited a bright blue emission under excitation wavelength of 365 nm. As a fluorescent probe, it appears excellent selectivity and sensitivity to assay Hg2+. When Hg2+ were added to B-CQDs, its bright blue fluorescence was obviously quenched. Under optimum conditions, the sensor shows a wide linear range (0 ~ 150 μM) and a low detection limit (2.5 μM). Interestingly, the quenched fluorescence of B-CQDs containing Hg2+ could be turned on by adding reducing agent EDTA-2Na or I-. Furthermore, it was applied successfully to assay Hg2+ in real sample. More importantly, B-CQDs was found to be nontoxic and can be used as bioimaging agent for MCF-7 cell labeling. The possible fluorescence quenching mechanisms of the probe are also discussed in detail. This study provides a new approach for fabricating a multifunctional fluorescent probe and a prospective application in environmental monitoring. [Display omitted] • B-CQDs were successfully synthesized by one-step hydrothermal method. • B-CQDs as fluorescent probe were specific for Hg2+ with low detection limit and wide linear range. • B-CQDs were used for Hg2+ determination with selectivity, immunity and recovery. • B-CQDs were successfully applied to assay Hg2+ in tap water. • B-CQDs as the fluorescent marker could label MCF-7 cancer cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 648
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 157541803
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2022.129150