期刊
ANALYST
卷 141, 期 9, 页码 2657-2664出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5an02231b
关键词
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资金
- Natural Science Foundation of China [21305133, 51173087, 21575071]
- Taishan Scholars Program
- Australian Research Council Australian Research Council Centre of Excellence in Convergent Bio-Nano Science and Technology [CE140100036]
- ARC Australian Laureate Fellowship [FL150100060]
- [12-1-4-2-2-jch]
Carbon quantum dots (CQDs) are attracting tremendous interest owing to their low toxicity, water dispersibility, biocompatibility, optical properties and wide applicability. Herein, CQDs with an average diameter of (4.0 +/- 0.2) nm and high crystallinity were produced simply from the electrochemical oxidation of a graphite electrode in alkaline alcohols. The as-formed CQDs dispersion was colourless but the dispersion gradually changed to bright yellow when stored in ambient conditions. Based on UV-Vis absorption, fluorescence spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and high-resolution transmission electron microscopy (HRTEM), this colour change appeared to be due to oxygenation of surface species over time. Furthermore, the CQDs were used in specific and sensitive detection of ferric ion (Fe3+) with broad linear ranges of 10-200 mu M with a low limit of detection of 1.8 mu M (S/N = 3). The application of the CQDs for Fe3+ detection in tap water was demonstrated and the possible mechanism was also discussed. Finally, based on their good characteristics of low cytotoxicity and excellent biocompatibility, the CQDs were successfully applied to cell imaging.
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