Graphene quantum dots as a fluorescent sensing platform for highly efficient detection of copper(II) ions

Wang, Fengxiang; Gu, Zhenyan; Lei, Wu; Wang, Wenjuan; Xia, Xifeng; Hao, Qingli

doi:10.1016/j.snb.2013.09.009

Cited by 318 publications

(156 citation statements)

References 55 publications

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“…The GQDs solution has a broad absorption with a weak shoulder at approximately 300 nm. These results are consistent with those from a previous report [27]. The fluorescence spectrum of the GQDs has a strong speak at 427 nm when the excitation was 320 nm.…”

Section: Resultssupporting

confidence: 93%

“…With this property, we designed a GQDs-Cu 2+ system that acts as an effective fluorescent probe for sulfide ions detection in water. The oxygen-containing groups on the GQDs surface can interact with Cu 2+ ions, leading to fluorescence quenching of the GQDs [27]. When sulfide ions were added to the assay solution, a turn on fluorescence signal was detected.…”

Section: −36mentioning

confidence: 99%

“…GQDs were synthesized according to previously described methods [27]. In summary, GO (5 mg) reacted with concentrated H 2 SO 4 (30 mL) and HNO 3 (10 mL) for 5 h under ultrasonic conditions using the ultrasonic cleaner.…”

Section: Synthesis Of Graphene Quantum Dotsmentioning

confidence: 99%

“…Meanwhile, other ions show little quenching of fluorescence of the GQDs. The selectivity quenching may be ascribed to the fact that Cu 2+ ions have a strong affinity toward the oxygencontaining groups on the GQDs surface than other metal ions [27]. Therefore, Cu 2+ ions were selected as the optimal quenching ion.…”

Section: Optimization Of Experimental Conditionsmentioning

confidence: 99%

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Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Peng

Xiong

et al. 2015

Microchim Acta

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A fluorescent probe for the sensitive and selective determination of sulfide ions is presented. It is based on the use of graphene quantum dots (GQDs) which emit strong and stable blue fluorescence even at high ionic strength. Copper(II) ions cause aggregation of the GQDs and thereby quench fluorescence. The GQDs-Cu(II) aggregates can be dissociated by adding sulfide ions, and this results in fluorescence turn on. The change of fluorescence intensity is proportional to the concentration of sulfide ions. Under optimal conditions, the increase in fluorescence intensity on addition of sulfide ions is linearly related (r 2 =0.9943) to the concentration of sulfide ions in the range from 0.20 to 20 μM, and the limit of detection is 0.10 μM (at 3 σ/s). The fluorescent probe is highly selective for sulfide ions over some potentially interfering ions. The method was successfully applied to the determination of sulfide ions in real water samples and gave recoveries between 103.0 and 113.0 %.

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Section: Resultssupporting

confidence: 93%

Section: −36mentioning

confidence: 99%

Section: Synthesis Of Graphene Quantum Dotsmentioning

confidence: 99%

Section: Optimization Of Experimental Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Peng

Xiong

et al. 2015

Microchim Acta

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“…Most importantly, some recent studies [4][5][6][7] have demonstrated that the PL intensity is significantly quenched in the presence of certain heavy-metal ions (Hg 2+ , Fe 2+ , Cu 2+ , Pb 2+ ), thus triggering the interest of researchers in view of fast and cheap sensors for these elements.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to Heavy-Metal Ions of Cage-Opening Fullerene Quantum Dots

Ciotta

Prosposito

Tagliatesta

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:In this study, we have carried out a characterization of the quenching effect produced by some commonly encountered metal ions (Co 2+ , Cu 2+ , Ni 2+ , Pb 2+ , Cd 2+ , As 5+ ) on the photoluminescence of water suspensions of open-cage fullerene quantum dots prepared with a modified Hummers method. The response to heavy-metal ions occurs through a selective quenching of the PL emission and modifications of the absorption spectrum.

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Carbon‐Based Luminescent Nanosensors

López‐Lorente

2016

Encyclopedia of Analytical Chemistry

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Carbon nanomaterials have raised great attention in the past years for the development of luminescent nanosensors. These nanomaterials possess excellent photoluminescence properties, which combined with their low cytotoxicity and high biocompatibility make them ideal platforms for (bio)sensing. In this article, we have focused on recently developed fluorescent carbon nanomaterials such as graphene quantum dots, graphene oxide, and carbon dots, which have emerged as alternative to conventional dyes and semiconductor quantum dots. The different mechanisms underlying the sensors are discussed and examples of (bio)sensors involving these nanomaterials are described. The combination of two nanomaterials in the same sensing scheme has been widely employed in the past years combining both the emission properties of nanomaterials and their quenching ability. Finally, examples of sensors based on carbon nanomaterials developed for the determination of other nanomaterials of the same or different nature are presented.

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Graphene quantum dots as a fluorescent sensing platform for highly efficient detection of copper(II) ions

Cited by 318 publications

References 55 publications

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Sensitivity to Heavy-Metal Ions of Cage-Opening Fullerene Quantum Dots

Carbon‐Based Luminescent Nanosensors

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