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Issue 9, 2015
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Highly luminescent nitrogen-doped carbon quantum dots as effective fluorescent probes for mercuric and iodide ions

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Abstract

Nitrogen-doped carbon quantum dots (N-CQDs) with strong blue fluorescence and a high quantum yield of 66.8% were synthesized via a facile one-pot hydrothermal treatment with ammonium citrate and ethylenediamine as carbon and nitrogen sources, respectively. The blue fluorescence emission is independent of the excitation wavelengths and is very stable in a wide pH range. These N-CQDs, dispersed well in water and other polar solvents, showed a highly selective and sensitive detection of hazardous and toxic Hg2+ in the range of 10 nM to 20 μM through a fluorescence quenching process. The N-CQDs quenched by Hg2+ exhibited high selectivity and sensitivity for I in the range of 0.5 μM to 40 μM via a fluorescence recovery process. A possible charge transfer process responsible for the effective detection was proposed according to the UV-vis absorption and fluorescence decay measurements.

Graphical abstract: Highly luminescent nitrogen-doped carbon quantum dots as effective fluorescent probes for mercuric and iodide ions

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Supplementary files

Article information


Submitted
02 Dec 2014
Accepted
24 Dec 2014
First published
30 Dec 2014

J. Mater. Chem. C, 2015,3, 1922-1928
Article type
Paper
Author version available

Highly luminescent nitrogen-doped carbon quantum dots as effective fluorescent probes for mercuric and iodide ions

Z. Li, H. Yu, T. Bian, Y. Zhao, C. Zhou, L. Shang, Y. Liu, L. Wu, C. Tung and T. Zhang, J. Mater. Chem. C, 2015, 3, 1922
DOI: 10.1039/C4TC02756F

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