Journal
RSC ADVANCES
Volume 6, Issue 38, Pages 31884-31888Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra26521e
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Funding
- 973 Program of China [2013CB328804, 2014CB239701]
- Natural Science Foundation of China [61235007, 61575121, 21572132, 21372155]
- Professor of Special Appointment at Shanghai Institutions of Higher Learning (Eastern Scholar)
- Aeronautical Science Foundation of China [2015ZF57016]
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A facile one-step hydrothermal strategy to fabricate nitrogen-rich carbon dots (N-rich CDs) with melamine and citric acid as the precursors has been successfully developed. The as-prepared N-rich CDs exhibit a uniform quasi-spherical morphology, high N content of about 24 wt% and very strong photoluminescence (PL) with a high quantum yield of similar to 42%. Additionally, the PL emission of these N-rich CDs can be stabilized in a wide pH range from 4.0 to 11.0. More importantly, the N-rich CDs can be utilized as the label-free PL sensors for the highly selective and sensitive detection of Fe3+ ions in aqueous solution with a very low detection limit of 142 nM.
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