Journal
MATERIALS LETTERS
Volume 115, Issue -, Pages 233-236Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2013.10.086
Keywords
Nanoparticles; Oxidize; Luminescence
Funding
- Startup Project of Shaanxi University of Technology [SLGQD13-3]
- Natural Science Foundation of China [21373132]
- Society Progress Project of Shaanxi Province of China [2012K19-03-03]
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Carbon dots (CDs) were synthesized by the nitric acid oxidation of activated carbon. The experimental measurements showed that the resulting particles exhibited an average diameter of 50 nm and tunable emission wavelength. The fluorescence intensity of CDs was effectively quenched by copper ion (Cu2+) (turn-off) and restored reversibly by the addition of oxalate (turn-on). Based on this phenomenon, an off-on approach for detection of Cu2+ and oxalate using CDs as fluorescent probes was performed. The quantitative detection of Cu2+ ranged from 1.0 x 10(-5) to 9.0 x 10(-5) mol/L was allowed, and the concentrations of oxalate in the range of 1.0 x 10(-5)-7.0 x 10(-5) mol/L exhibited a linear relationship with the relative fluorescence intensity with a correlation coefficient R-2=0.9945. Furthermore, the detection limit for oxalate was as low as 1.0 x 10(-6) mol/L, and the influences of 14 kind potential interference ions on oxalate determination were examined. (C) 2013 Elsevier B.V. All rights reserved.
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