期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 24, 页码 13242-13247出版社
AMER CHEMICAL SOC
DOI: 10.1021/am4042355
关键词
on-off-on fluorescent; carbon dots; nanochemosensor; inner filter effect (IFE); chromium(VI); ascorbic acid
资金
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry
- National Natural Science Foundation of China [21201159, 61176016, 21104075]
- China Postdoctoral Science Foundation [2012M510892]
- Ministry of Science
- Hundred Talent Program of CAS
- Innovation and Entrepreneurship Program of Jilin
- CIAC start-up fund
Chromium(VI) [Cr(VI)] is considered as a severe environmental pollutant, due to its highly toxic and carcinogenic properties. Therefore, low cost, highly sensitive sensors for the determination of Cr(VI) are highly demanded. It is well-known that highly luminescent carbon dots (CDs) have been successfully applied as fluorescent nanosensors for pH, ions, and molecular substances. In the present work, we have demonstrated an on-off fluorescent CD probe for detecting Cr(VI) based on the inner filter effect (IFE) because the absorption bands of Cr(IV) fully covered the emission and excitation bands of CDs. This CD-based nanosensor provides obvious advantages of simplicity, convenience, rapid response, high selectivity, and sensitivity, which have potential application for the detection of Cr(VI) in the environmental industry. In addition, because Cr(VI) can be reduced to low valent chromium species easily by reductant, resulting in the elimination of the WE and recovery of CD fluorescence, the CD-Cr(VI) mixture could behave as an off-on type fluorescent probe for reductant. We employed ascorbic acid (AA) as an example molecule to demonstrate this off-on type fluorescent probe.
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