Sulfur-doped graphene quantum dots as a novel fluorescent probe for highly selective and sensitive detection of Fe(3+)

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...

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Bibliographic Details
Published in:Analytical chemistry (Washington) Vol. 86; no. 20; p. 10201
Main Authors: Li, Shuhua, Li, Yunchao, Cao, Jun, Zhu, Jia, Fan, Louzhen, Li, Xiaohong
Format: Journal Article
Language:English
Published: United States 21.10.2014
Subjects:
Blood Chemical Analysis - methods
Fluorescent Dyes - chemistry
Graphite - chemistry
Iron - chemistry
Limit of Detection
Quantum Dots
Sulfur - chemistry
Water - chemistry
ISSN:1520-6882, 1520-6882
Online Access:Get more information
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Summary: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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ISSN:1520-6882
1520-6882
DOI:10.1021/ac503183y