1. Ruoxin Hu, Lili Li and Wei Jun Jin*.

    Controlling speciation of nitrogen in nitrogen-doped carbon dots by ferric ion catalysis for enhancing fluorescence.

Carbon(2017, 111, 133-141)

Abstract

     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.

2. Liyuan Qin, Lingjie Hou, Jia Feng, Jianbin Chao, Yu Wang* and Wei Jun Jin*.

    A novel chemosensor with visible light excitability for sensing CN_ in aqueous medium and living cells via a Cu2+ displacement approach.
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Anal.Methods (2012,9, 259-266)

3. Fang Yu, Ling Jie Hou, Li Yuan Qin, Jian Bin Chao, Yu Wang* and Wei Jun Jin*.

   A new colorimetric and turn-on fluorescent chemosensor for Al3+ in aqueous medium and its application in live-cell imaging.
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J.Photoch.Photobio.A (2016,315, 8-13)