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Nanomaterials 2018, 8(6), 386; https://doi.org/10.3390/nano8060386

Green and Facile Synthesis of Nitrogen and Phosphorus Co-Doped Carbon Quantum Dots towards Fluorescent Ink and Sensing Applications

1
School of Material Science and Engineering, University of Jinan, Jinan 250022, China
2
School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China
Theses authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 23 May 2018 / Accepted: 28 May 2018 / Published: 31 May 2018
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Abstract

Fluorescent carbon quantum dots (CQDs) have held great promise in analytical and environmental fields thanks to their congenitally fascinating virtues. However, low quantum yield (QY) and modest fluorescent stability still restrict their practical applications. In this investigation, a green hydrothermal strategy has been devised to produce water-soluble nitrogen/phosphorus (N/P) co-doped CQDs from edible Eleocharis dulcis with multi-heteroatoms. Without any additives and further surface modifications, the resultant CQDs exhibited tunable photoluminescence just by changing hydrothermal temperatures. Appealingly, they showed remarkable excitation-dependent emission, high QY, superior fluorescence stability, and long lifetime. By extending the CQDs solutions as a “fluorescent ink”, we found their potential application in the anti-counterfeit field. When further evaluated as a fluorescence sensor, the N/P co-doped CQDs demonstrated a wide-range determination capability in inorganic cations, and especially the remarkable sensitivity and selectivity for elemental Fe3+. More significantly, the green methodology we developed here can be readily generalized for scalable production of high-quality CQDs with tunable emission for versatile applications. View Full-Text
Keywords: carbon quantum dots; N/P co-doped; tunable photoluminescence; fluorescent ink; fluorescence sensor carbon quantum dots; N/P co-doped; tunable photoluminescence; fluorescent ink; fluorescence sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bao, R.; Chen, Z.; Zhao, Z.; Sun, X.; Zhang, J.; Hou, L.; Yuan, C. Green and Facile Synthesis of Nitrogen and Phosphorus Co-Doped Carbon Quantum Dots towards Fluorescent Ink and Sensing Applications. Nanomaterials 2018, 8, 386.

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