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- W2898865462 abstract "We developed a microreactor with porous copper fibers for synthesizing nitrogen-doped carbon dots (N-CDs) with a high stability and photoluminescence (PL) quantum yield (QY). By optimizing synthesis conditions, including the reaction temperature, flow rate, ethylenediamine dosage, and porosity of copper fibers, the N-CDs with a high PL QY of 73% were achieved. The PL QY of N-CDs was two times higher with copper fibers than without. The interrelations between the copper fibers with different porosities and the N-CDs were investigated using X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). The results demonstrate that the elemental contents and surface functional groups of N-CDs are significantly influenced by the porosity of copper fibers. The N-CDs can be used to effectively and selectively detect Hg2+ ions with a good linear response in the 0~50 μM Hg2+ ions concentration range, and the lowest limit of detection (LOD) is 2.54 nM, suggesting that the N-CDs have great potential for applications in the fields of environmental and hazard detection. Further studies reveal that the different d orbital energy levels of Hg2+ compared to those of other metal ions can affect the efficiency of electron transfer and thereby result in their different response in fluorescence quenching towards N-CDs." @default.
- W2898865462 created "2018-11-09" @default.
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- W2898865462 date "2018-11-02" @default.
- W2898865462 modified "2023-10-15" @default.
- W2898865462 title "Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg2+ Detection" @default.
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- W2898865462 doi "https://doi.org/10.3390/nano8110900" @default.
- W2898865462 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6265737" @default.
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