Graphene quantum dots as on-off-on fluorescent probes for chromium(VI) and ascorbic acid

Huang, Shan; Qiu, Hangna; Zhu, Fawei; Lu, Shuangyan; Xiao, Qi

doi:10.1007/s00604-015-1508-6

Cited by 129 publications

(72 citation statements)

References 32 publications

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“…In fact, the present detection limit is quite lower than the acceptance limit specified by WHO. Moreover, the comparison of LOD for Cr 6+ reported in the literature, as shown in Table , highlights the superior detection efficiency of the present detection system, besides the work done by Zhang et al and Huang et al Most importantly, the CDs have been used without further purification and stabilization in the proposed technique of the present study.…”

Section: Resultsmentioning

confidence: 58%

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

et al. 2019

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In this study, we have reported the synthesis of luminescent carbon dots (CDs) from indigenous potato sources by simple heating reactions. The as‐synthesized CDs exhibited an average size of ~ 5.97 nm with a quantum yield (QY) of 6.08%. Furthermore, the CDs possessed high water‐solubility, possibly due to the presence of ─COOH and ─OH groups on their surfaces. The quenching of luminescence of the CDs specifically by Cr6+ and Fe3+ ions was used to detect chromium and iron in the water sample. The minimum limit of detection (LOD) for Cr6+ and Fe3+ ions was found to be 0.012 μM and 0.000549 μM, respectively, in a linear range of 0.5 μM‐100 μM and 0.5 μM‐5 μM for Cr6+ and Fe3+, respectively, which was well below the concentration specified by WHO. We used our sensing system to detect the metal ions in water from the Brahmaputra River as well as in tannery water. In addition, the MTT‐based cell viability experiments showed that the CDs were nontoxic within 200 μg/mL. High quantum yield and the easy uptake of CDs enabled the quick labelling of cytoplasm of the HeLa cells, which can be further attributed to bioimaging applications.

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Section: Resultsmentioning

confidence: 58%

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

et al. 2019

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“…[38] and, along with the absorption curve and the dependence of the emission peak on the excitation wavelength (Fig. 1b,c), showed the characteristic spectral features found in regular GOQDs synthesized from graphite or citric acid [28][29][30][31][32][33][34] [35]. In particular, the absorption spectrum (Fig.…”

Section: Optical Characterization Of Ufqdsmentioning

confidence: 93%

“…Electron transfer to partly filled d orbitals or complexation with layer aggregation were taken into account to explain the two cases, respectively. Finally, a selective response to Cr 6+ was found at pH 4.5 in commercially available GQDs [34]. It should be pointed out that such a surprising and somehow puzzling variety of response, in some cases with contradictory results, was obtained in carbon quantum dots which should basically share a similar structure modelled on graphene, i.e.…”

Section: +mentioning

confidence: 96%

“…The spectral profile and peak-emission wavelength of this emission can relatively be controlled by tailoring dimensions, chemical functionalization and excitation wavelength. Most importantly, some recent studies [28][29][30][31][32][33][34][35] have demonstrated that the PL intensity is significantly quenched in the presence of certain heavy-metal ions (Hg triggering the interest of researchers in view of fast and cheap sensors for these elements, which can be harmful to environment and toxic for human health [36].…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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A novel type of graphene-like quantum dots, synthesized by oxidation and cage-opening of C60 buckminsterfullerene, has been studied as a fluorescent and absorptive probe for heavy-metal ions.The lattice structure of such unfolded fullerene quantum dots (UFQDs) is distinct from that of graphene since it includes both carbon hexagons and pentagons. The basic optical properties, however, are similar to those of regular graphene oxide quantum dots. On the other hand, UFQDs behave quite differently in the presence of heavy-metal ions, in that multiple sensitivity to Cu 2+ , Pb 2+ and As(III) was observed through comparable quenching of the fluorescent emission and different variations of the transmittance spectrum. By dynamic light scattering measurements we confirmed, for the first time in metal sensing, that this response is due to multiple complexation and subsequent aggregation of UFQDs. Nonetheless, the explanation of the distinct behaviour of transmittance in the presence of As(III) and the formation of precipitate with Pb 2+ require further studies. These differences, however, also make it possible to discriminate between the three metal ions in view of the implementation of a selective multiple sensor.

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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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Graphene quantum dots as on-off-on fluorescent probes for chromium(VI) and ascorbic acid

Cited by 129 publications

References 32 publications

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

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

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