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Nitrogen- Doped Graphene Quantum Dots: “Turn-off” Fluorescent Probe for Detection of Ag+ Ions

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Abstract

Highly luminescent nitrogen-doped graphene quantum dots (N-GQDs) were prepared from glucose and ammonia as carbon and nitrogen sources, respectively. The N-GQDs showed a strong emission at 458 nm with excitation at 360 nm. The N-GQDs exhibited analytical potential as sensing probes for silver ions determination. Factors affecting the fluorescence sensing of Ag+ ions such as pH, N-GQDs concentration and incubation time were studied using Box-Behnken experimental design. The optimum conditions were determined as pH 7, N-GQDs concentration 1 mg/mL and time 60 min. It suggested that N-GQDs exhibited high sensitivity and selectivity toward Ag+. The linear range of N-GQDs and the limit of detection (LOD) were 0.2–40 μM and 168 nM, respectively. The N-GQDs-based Ag+ ions sensor was successfully applied to the determination of Ag+ in tap water and real river water samples.

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Authors and Affiliations

  1. Department of Chemistry, Ilam University, Ilam, Iran

    Reza Tabaraki & Ashraf Nateghi

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  1. Reza Tabaraki
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  2. Ashraf Nateghi
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Correspondence to Reza Tabaraki.

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Tabaraki, R., Nateghi, A. Nitrogen- Doped Graphene Quantum Dots: “Turn-off” Fluorescent Probe for Detection of Ag+ Ions. J Fluoresc 26, 297–305 (2016). https://doi.org/10.1007/s10895-015-1714-y

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  • DOI: https://doi.org/10.1007/s10895-015-1714-y

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