Journal
CARBON
Volume 111, Issue -, Pages 133-141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.09.038
Keywords
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Funding
- National Natural Science Foundation of China [90922023]
- Fundamental Research Funds for the Central Universities of China
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The speciation of doped-nitrogen (pyridinic N, pyrrolic N, graphitic N and amino N) was controlled by ferric ion catalysis for improving fluorescence of nitrogen-doped carbon dots (NCDs). Comparing to the synthesis of NCDs without ferric ion catalysis, the present strategy induces two following effects: (1) an increase of pyrrolic N and a decrease of pyridinic N; (2) a more well-organized arrangement of graphitic core and more N moieties exposed on the surface of NCDs. Consequently, absolute fluorescence quantum yield is increased from 6.2% to 27.0% and fluorescence can be further enhanced in acidity-media. Such phenomena provide solid evidence that pyrrolic N enhances the fluorescence of NCDs while pyridinic N inhibits it. Besides, NCDs achieve selective response to ferric ions. The present work provides a deeper insight into the understanding of luminescence mechanism and causes broader interest in manipulating CDs chemical structure. (C) 2016 Elsevier Ltd. All rights reserved.
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