Nitrogen-doped carbon quantum dots as fluorescent probe for "off-on" detection of mercury ions, l-cysteine and iodide ions.

Author(s) Huang, H.; Weng, Y.; Zheng, L.; Yao, B.; Weng, W.; Lin, X.
Journal J Colloid Interface Sci
Date Published 2017 Jul 20

The application of fluorescent nanoparticles to the detection of inorganic ions and organic compounds has been attracted wide attention recently. In this paper, an "off-on" method for highly sensitive and selective detection of Hg(2+) and l-cysteine (l-Cys) or Hg(2+) and I(-) using home-made nitrogen-doped carbon quantum dots (N-CQDs) as fluorescent probe was reported. The N-CQDs with a fluorescence quantum yield of 42.2% were prepared using tartaric acid, citric acid and ethanediamine as the precursors in the oleic acid media. The fluorescence of the obtained N-CQDs could be quenched selectively and sensitively by the addition of Hg(2+) (turn-off) with a detection limit of 83.5nM. When l-Cys or I(-) was added into the N-CQDs-Hg(2+) system, the fluorescence was recovered effectively (turn-on). This process could be used to the detection of l-Cys or I(-) with a detection limit of 45.8 and 92.3nM, respectively.

DOI 10.1016/j.jcis.2017.07.076
ISSN 1095-7103
Citation J Colloid Interface Sci. 2017;506:373378.

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