Journal
LUMINESCENCE
Volume 32, Issue 6, Pages 970-977Publisher
WILEY
DOI: 10.1002/bio.3279
Keywords
carbon dots; Hg2+; hydrogel film; ion detection; polyvinylamine
Categories
Funding
- Guangxi Colleges and Universities Key Laboratory of Synthetic and Natural Functional Molecular Chemistry
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A simple microwave-assisted solvothermal method was used to prepare fluorescent nitrogen-doped carbon dots (N-CDs) with high fluorescence quantum yield (79.63%) using citric acid and N-(2-hydroxyethyl)ethylenediamine as starting materials. The PVAm-g-N-CDs grafted products were synthesized by amide bond formation between the carboxylic groups of N-CDs and amine groups of polyvinylamine (PVAm). Fluorescent hydrogel films (PVAm-g-N-CDs/PAM) were synthesized by interpenetration polymer network polymerization of PVAm-g-N-CDs and acrylamide (AM). When used for ion detection, we found that the fluorescence of the hydrogel films was clearly quenched by addition of Hg2+. Repeatability tests on using the hydrogel films for Hg2+ detection showed that they could be applied at least three times. The PVAm-g-N-CDs/PAM could serve as an effective fluorescent sensing platform for sensitive detection of Hg2+ ions with a detection limit of 0.089 mu mol/L. This work may offer a new approach for developing recoverable and sensitive N-CDs-based sensors for biological and environmental applications.
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