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Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg 2+ Detection.
- Source :
-
Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2018 Nov 02; Vol. 8 (11). Date of Electronic Publication: 2018 Nov 02. - Publication Year :
- 2018
-
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 Hg <superscript>2+</superscript> ions with a good linear response in the 0~50 μM Hg <superscript>2+</superscript> 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 Hg <superscript>2+</superscript> 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.
Details
- Language :
- English
- ISSN :
- 2079-4991
- Volume :
- 8
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Nanomaterials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 30400227
- Full Text :
- https://doi.org/10.3390/nano8110900