Journal
TALANTA
Volume 239, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2021.123110
Keywords
Cu-doped carbon dots; Visual discrimination; Phenylenediamine isomers; Ratiometric fluorescence; H2O2 detection
Categories
Funding
- Natural Science Foundation of China [21665001, 21874030]
- BAGUI Scholar Program
- Natural Science Foundation of Guangxi Province [2018GXNSFBA281205]
- Young and Middle-aged Science Project of Guangxi Province [2021KY0738]
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A novel fluorescent probe incorporating Cu-doped carbon dots was developed for naked-eye discrimination of phenylenediamine isomers and highly sensitive ratiometric fluorescence detection of H2O2. The sensor showed outstanding peroxidase-like activity and stability, and was able to detect H2O2 with a detection limit of 5.0 nM, with potential applications in biologically related studies.
Changing a detection analyte into a colored material is a key challenge for visual discrimination of isomers. In this work, a novel fluorescent probe incorporating Cu-doped carbon dots (Cu-CDs), for the first time, was developed for naked-eye discrimination of phenylenediamine isomers and highly sensitive ratiometric fluorescence detection of H2O2. In this strategy, Cu-CDs were synthesized by a facile hydrothermal approach using citric acid, formamide, and CuCl2 as reactants. The prepared Cu-CDs exhibited outstanding peroxidase-like activity and stability. Consequently, a chemosensor platform based on Cu-CDs was constructed to enable naked-eye discrimination of phenylenediamine isomers through the H2O2-mediated oxidation reaction. Moreover, a Cu CDs-based ratiometric fluorescence sensor was proposed as a means to sensitively detect H2O2 with a detection limit of 5.0 nM. The sensor was further employed for monitoring H2O2 in human serum, indicating its potential applications in other biologically related study.
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