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Sulfur-Doped Graphene Quantum Dots as a Novel Fluorescent Probe for Highly Selective and Sensitive Detection of Fe3+
Abstract
Sulfur-doped graphene quantum dots (S-GQDs) with stable blue-green fluorescence were synthesized by one-step electrolysis of graphite in sodium p-toluenesulfonate aqueous solution. Compared with GQDs, the S-GQDs drastically improved the electronic properties and surface chemical reactivities, which exhibited a sensitive response to Fe(3+). Therefore, the S-GQDs were used as an efficient fluorescent probe for highly selective detection of Fe(3+). Upon increasing of Fe(3+) concentration ranging from 0.01 to 0.70 μM, the fluorescence intensity of S-GQDs gradually decreased and reached a plateau at 0.90 μM. The difference in the fluorescence intensity of S-GQDs before and after adding Fe(3+) was proportional to the concentration of Fe(3+), and the calibration curve displayed linear regions over the range of 0-0.70 μM. The detection limit was 4.2 nM. Finally, this novel fluorescent probe was successfully applied to the direct analysis of Fe(3+) in human serum, which presents potential applications in clinical diagnosis and may open a new way to the design of effective fluorescence probes for other biologically related targets.
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Cites
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Self-citationHeteroatom doped graphene engineering for energy storage and conversion
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Metadata
- Authors
- Li, S., Li, Y., Cao, J., Zhu, J., Fan, L., & Li, X.
- Venue
- Analytical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-10-03
- Volume
- 86
- Issue
- 20
- Pages
- 10201-10207
- ISSN
- 0003-2700 (ISSN-L)
- 1520-6882
- OpenAlex
- W2333244007
- Cited by
- 564
- References
- 2
- FWCI
- 22.04
- Type
- journal article
- Language
- en
- Open access
- closed
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