WANG Jing-yuan, ZHANG Yue-cheng, MA Hong-yan etc. Synthesized of Carbon Quantum Dots from Red Dates and as A “Off-On” Fluorescence Probe for High Sensitive Detection of Rutin[J]. Chinese Journal of Luminescence, 2018,39(4): 600-607
WANG Jing-yuan, ZHANG Yue-cheng, MA Hong-yan etc. Synthesized of Carbon Quantum Dots from Red Dates and as A “Off-On” Fluorescence Probe for High Sensitive Detection of Rutin[J]. Chinese Journal of Luminescence, 2018,39(4): 600-607 DOI: 10.3788/fgxb20183904.0600.
Synthesized of Carbon Quantum Dots from Red Dates and as A “Off-On” Fluorescence Probe for High Sensitive Detection of Rutin
A one-step hydrothermal method was developed for the preparation of carbon quantum dots(CQDs) with strong fluorescence by using red dates as precursors. The luminescence properties of the CQDs were studied by fluorescence spectroscopy
UV-Vis spectrum
transmission electron microscopy
infrared spectrum
X-ray powder diffraction spectroscopy. In pH=4.00 NaAc-HAc buffer solution
after potassium permanganate(KMnO
4
) was added in CQDs solution
the fluorescence of CQDs was quenched
and the fluorescence signal of the system was in the "off" state. In the presence of rutin
the fluorescence of CQDs was recovered because KMnO
4
preferred to react with rutin
which results in the departure of KMnO
4
from the surface of the CQDs
and the fluorescence signal of the system was "open". The degree of recovery of CQDs fluorescence intensity was proportional to the rutin concentration
which provided a new method for the detection of rutin with high sensitivity and selectivity based on the fluorescence quenching-recovery properties of CQDs. The mechanism of fluorescence quenching of CQDs by KMnO
4
was studied
and the reaction conditions were optimized. Under optimal conditions
the recovered fluorescence of CQDs is linearly related with the rutin concentration in the range 2.510
-7
-1.010
-5
mol/L
the detection limit is 1.510
-7
mol/L. The present method is applied for the detection of rutin in samples with satisfactory results.
关键词
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references
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