The electron-transfer based interaction between transition metal ions and photoluminescent graphene quantum dots (GQDs): A platform for metal ion sensing

Huang, Huei-Ping; Liao, Lei; Xu, Xiao Li; Zou, Mingjian; Liu, Feng; Li, Na

doi:10.1016/j.talanta.2013.08.055

Cited by 123 publications

(90 citation statements)

References 34 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: 98%

“…Only the PL quenching due to copper(II), however, could be efficiently recovered with the addition of cysteine, a more specific metal chelator. Liao et al [33] found a quenching effect at pH 8.5 in the presence of…”

Section: +mentioning

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%

See 4 more Smart Citations

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: 98%

Section: +mentioning

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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Reversible/Irreversible Photobleaching of Fluorescent Surface Defects of SiC Quantum Dots: Mechanism and Sensing of Solar UV Irradiation

Dai

Zhang

Wang

et al. 2019

Adv Materials Inter

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Knowledge about photobleaching properties of the fluorescent surface defects of the semiconductor quantum dots (QDs) is crucial for their applications. Here, the photobleaching properties of the fluorescent surface defects of the colloidal 3C‐SiC QDs are reported. The combined experimental and theoretical study reveals that the observed violet fluorescence at around 392 nm stems from the carboxylic acid group‐related surface defects. When the SiC QDs are exposed to the UV irradiation, the 392 nm fluorescent surface defects show both reversible and irreversible photobleaching, whereas the 438 nm fluorescent surface defects show only irreversible photobleaching. The photochemical mechanisms dominating these phenomena are explored. The photobleaching property of the SiC QDs is utilized to detect the solar UV irradiation with high accuracy. The photobleaching of the SiC QDs is highly sensitive to the hydrogen or metal ion concentration in the colloid solution. These findings deepen the understanding of the properties of the fluorescent surface defects of the SiC QDs and pave the way for their applications in sensing.

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The electron-transfer based interaction between transition metal ions and photoluminescent graphene quantum dots (GQDs): A platform for metal ion sensing

Cited by 123 publications

References 34 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

Reversible/Irreversible Photobleaching of Fluorescent Surface Defects of SiC Quantum Dots: Mechanism and Sensing of Solar UV Irradiation

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