Abstract
A novel nitrogen-doped carbon quantum dots (N-CDs) were prepared by the microwave irradiation method. The fluorescence quenching effect of Co(II) on the N-CDs was studied in the sodium dodecyl sulfate (SDS) medium and the fluorescence quenching was sensitized in the SDS. The linear range of calibration curve for the determination of Co(II) was 0.17µg/mL-11.8µg/mL and the limit of detection was 0.052µg/mL. The method has been applied for the determination of Co(II) in samples with satisfactory results.
Highlights
Cobalt [Co(II)] is a biologically significant trace element that enters the human body from natural and man-made sources [1]
Nitrogen-doped carbon dots (N-CDs) were synthesized by the microwave synthesis method, and the specific steps were as follows (Fig. 1): 0.1 g glucose and 450 μL ethylenediamine were mixed into 10 mL solution, Ouwen XU et al.: A Novel Surfactant Sensitized Fluorescent Sensor for Co(II) Based on Nitrogen Doped Carbon Quantum Dots put into polytetrafluoroethylene tube, and the reaction was carried out under the condition that the reaction temperature increased in 3 min and kept for 10 min in a microwave digestion apparatus with microwave power of 450 W
3.1 Synthesis and characterization of nitrogen-doped carbon dots (N-CDs) 3.1.1 Synthesis optimization of N-CDs. This experiment investigated the effects of various conditions on the fluorescence quantum yield (Φ) of N-CDs
Summary
Cobalt [Co(II)] is a biologically significant trace element that enters the human body from natural and man-made sources [1]. It is necessary to establish a sensitive, selective, and accurate method to determine cobalt. Many studies show that introducing N element to nitrogen-doped carbon dots (N-CDs) preparation can enhance the fluorescence intensity of CDs due to the synergistic charge transfer between electron-rich nitrogen atoms and electron-deficient carbon atoms [18, 19]. The microwave method combines the advantages of the hydrothermal method and has become a very important process. It can provide dense, uniform, and efficient energy for the reaction system, making. Sodium dodecyl sulfate (SDS) sensitized fluorescence quenching method of CDs for the analysis Co(II) seems to be lacking. A novel SDS sensitized CDs fluorescence quenching method for analysis Co(II) was established
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