Journal
JOURNAL OF FLUORESCENCE
Volume 29, Issue 4, Pages 819-825Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-019-02408-x
Keywords
Carbon dots; Solvothermal; Fluorescence off-on probe; L-Cys detection
Funding
- National Natural Science Foundation of China [81660708]
- Natural Science Foundation of Jiangsu Province of China [BK20171389]
- Qinglan Project of Young Academic Leaders of Jiangsu Province
- Key Project of Science and Technology of Tibet [2015XZ01G70]
- Key Project of Tibetan Medical Administration of Tibet [2017005]
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Herein, a simple and efficient fluorescence analysis method for L-Cysteine (L-Cys) was established. The method was based on the fluorescent off-on mode of nitrogen doped carbon dots (NCDs). The NCDs were prepared via a facile one-step solvothermal method. In the process of exploring the bio-functional application of these newly synthesized NCDs, we found these NCDs with rich functional groups exhibited excellent optical properties. In addition, these newly synthesized NCDs showed an excitation-dependent emissions photolumine-scent (PL) property and exhibited good performance in the detection of Fe3+ ions by quenching the blue emission fluorescence. Interestingly, the quenched fluorescence of NCDs was recovered with the addition of L-Cys, which provided a novel approach for L-Cys detection. The NCDs-based fluorescent off-on sensor has a wide linear detection range (0-100 mu M), and a relatively low detection limits (0.35 mu M) for L-Cys. This simple fluorescent off-on approach is, very sensitive and selective for L-Cys detection, which also provides a new insight on NCDs biosensor application.
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