Journal
ANALYTICAL METHODS
Volume 8, Issue 10, Pages 2297-2304Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ay03088a
Keywords
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Funding
- Science and Technology Planning Project of Fujian Province, China [2012Y0052, 2014Y0045]
- Science and Technology Planning Project of Xiamen, China [3502Z20143018]
- Fujian Provincial Key Laboratory of Food Microbiology and Enzyme Engineering [M20140902]
- Foundation for Innovative Research Team of Jimei University, China [2010A007]
- National Undergraduate Training Programs for Innovation and Entrepreneurship [201410390009, 20141039047, 201510390026]
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A facile and green hydrothermal method was developed for the preparation of highly luminescent nitrogen-doped carbon dots (NCDs) by using anhydrous citric acid and urea as the carbon source and nitrogen source, respectively. The NCDs show good water-solubility and exhibit excitation-independent fluorescence behaviors at excitations of 300-390 nm with a quantum yield of 42.5% at a lambda(em) of 440 nm. Based on the fluorescence quenching strategy, the NCDs were successfully applied to the measurement of Hg2+ in tap and lake water samples with high sensitivity and excellent selectivity. The detection limit was 7.3 nmol L-1 (3 sigma, n = 9), indicating its potential applications for the detection of trace Hg2+ in water samples.
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