Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 506, Issue -, Pages 373-378Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.07.076
Keywords
Carbon quantum dots; Fluorescent probe; Mercury ions; L-Cysteine; Iodide ions
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Funding
- Natural Science Foundation of Fujian Province of China [2016Y0065, 2014J01053]
- Education Bureau of Fujian Province of China [JA13195, JK2011030]
- College Students' Innovative and Entrepreneurial Training Program [201710402023, 201710402071]
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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 Hg2+. and L-cysteine (L-Cys) or Hg2+ 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 Hg2+ (turn-off) with a detection limit of 83.5 nM. When L-Cys or I- was added into the N-CQDs-Hg2+ 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 92.3 nM, respectively. (C) 2017 Elsevier Inc. All rights reserved.
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