Pristine graphene quantum dots for detection of copper ions

Liu, Xiaofeng; Gao, Wei; Zhou, Xuemei; Ma, Yuanyuan

doi:10.1557/jmr.2014.145

Cited by 48 publications

(49 citation statements)

References 45 publications

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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%

“…It should be noted that a multiple response, i.e. sensitivity to more than one metal, was previously reported only in GOQDs prepared by chemical oxidation of carbon fibers [33,35] which demonstrated sensitivity to 7 metal ions including Cu 2+ , similar to our study, but also Ni observed in the present case is particularly interesting since it has never been reported in regular GQDs [29,30,32] except in the case of functionalization with specific organic groups [43,44]. This seems, therefore, a distinctive property of UFQDs in comparison with the GQDs studied so far.…”

Section: Optical Characterization Of Ufqdsmentioning

confidence: 99%

“…Nanosheet aggregation had already been suggested, without further analysis, as a possible explanation for the PL quenching in the presence of heavy-metal ions in GOQDs [32,33]. Very recently, multiple complexation has also been thoroughly characterized and discussed in GOQDs with mono-and divalent cations [47] ) and taken into account to explain the increased interaction between graphene sheets [35]. In the present case, the formation of aggregates was confirmed by DLS measurements on the UFQD solution before and after the addition of the heavy-metal ions.…”

Section: The Effect Of Heavy-metal Ions On the Transmittance Spectrummentioning

confidence: 99%

“…In another study with similar synthesis [32], a very efficient quenching effect to Hg 2+ was observed but no sensitivity to Fe 3+ was detected at all, while recovery of fluorescence was achieved by using cysteine. A more complex situation was found in two studies, both dealing with GQDs prepared by chemical oxidation of carbon fibers [33,35].…”

Section: Introductionmentioning

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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Section: Optical Characterization Of Ufqdsmentioning

confidence: 93%

Section: Optical Characterization Of Ufqdsmentioning

confidence: 99%

Section: The Effect Of Heavy-metal Ions On the Transmittance Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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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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Biomass‐derived porous carbon and colour‐tunable graphene quantum dots for high‐performance supercapacitor and selective probe for metal ion detection

Iyer

Ilangovan

2022

Intl J of Energy Research

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Summary The abundance of biomass waste and their alteration into carbon‐based electrodes grants practical application of the same. The present work describes all‐round utilization of orange peel waste for the synthesis of graphene quantum dots (GQDs) and carbon‐based electrode fabricated via facile hydrothermal reaction. The supernatant liquid is used for Fe3+ ion sensing and the remnant material is used for synthesis of porous carbon for supercapacitor application. GQDs synthesised via hydrothermal and microwave technique showed dual emission in blue and green wavelength region. Presence of Fe3+ ions quenched the fluorescence of GQDs and the selectivity is studied using other metal ions. Concentration of Fe3+ is varied upto 2.0 mM and the corresponding photoluminescence intensity is observed in the range 85–195 unit, indicating the inverse proportionality relation between these parameters. Carbon obtained has a combination of meso/macro and microporous structure with surface area of 64.002 m2 g−1. Porous OC electrode is employed in three electrode system and is fabricated as coin‐cell which delivered specific capacitance of 290.64 F g−1 and 146.9 F g−1, respectively. The asymmetrical supercapacitor delivered an efficiency of 86% after 10 000 charge‐discharge cycle. The resultant material derived from this work is suitable for both energy and sensing application.

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Pristine graphene quantum dots for detection of copper ions

Cited by 48 publications

References 45 publications

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Carbon‐Based Luminescent Nanosensors

Biomass‐derived porous carbon and colour‐tunable graphene quantum dots for high‐performance supercapacitor and selective probe for metal ion detection

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