Recent advances in graphene quantum dots for sensing

Sun, Hanjun; Wu, Li; Wei, Weili; Qu, Xiaogang

doi:10.1016/j.mattod.2013.10.020

Cited by 705 publications

(396 citation statements)

References 73 publications

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“…In particular, innovative carbon-based nanomaterials such as graphene quantum dots (GQDs) and graphene oxide quantum dots (GOQDs) have attracted much interest as stable, nontoxic, photoluminescent nanomaterials with possible applications in chemical and biological sensors, drug delivery, bio-imaging and energy conversion [7][8][9][10][11][12][13]. The physical origin of the photoluminescence (PL) from these carbonbased nanoparticles is still quite controversial and different mechanisms have been suggested, possibly acting together, mainly based on quantum confinement in sp 2 domains with a strong influence from edge and oxygen-containing functional groups [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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“…[8,[10][11][12] For examples, the GQDs/S 2 O 8 2À system has been used for metal ion sensing, [10,13] DNA detection, [14] and immunoassay. [15,16] The lack of ECL co-reactants may seriously limit the sensing applications of the new and promising ECL nanomaterials.…”

Section: àmentioning

confidence: 99%

An Electrochemiluminescent Biosensor Based on Interactions between a Graphene Quantum Dot−Sulfite Co‐reactant System and Hydrogen Peroxide

Chen

et al. 2017

ChemElectroChem

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Dedicated to Professor Qinjin Wan on the occasion of his 60th birthdayGraphene quantum dots (GQDs) are recently emerging carbon nanomaterials. GQDs have been recognized as attractive electrochemiluminescence (ECL) luminophores, owing to their environmental friendliness, facile preparation, easy labeling, and high ECL activity. However, in terms of the co-reactant of GQDs ECL, only strongly oxidative S 2 O 8 2À has been well studied and applied in GQD-based ECL sensing, which seriously limits the application of GQD ECL sensors. In the present work, we found that the commonly used reducing reagent, sulfite (SO 3 2À ), could serve as a new type of co-reactant of GQD ECL. Moreover, GQDs exhibited much higher ECL activity than spherical carbon quantum dots when using SO 3 2À as the co-reactant, owing to more abundant surface states of GQDs. Further investigation showed that GQD/SO 3 2À ECL could be sensitively quenched by H 2 O 2 at physiological pH. On this basis, new, green, and simple ECL chemical and biological sensors have been proposed for the detection of H 2 O 2 and biologically interesting molecules such as glucose. Additionally, the ECL reaction and sensing mechanisms have also been studied and discussed.

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“…The PL properties of GQDs often exhibit selective quenching in the presence of specific ions or molecules, providing a platform for the development of high performance sensors [44] . In water, 2,4,6-trinitrotoluene (TNT) interacts via π-π stacking with GQDs in a manner that suppresses PL emission via fluorescence resonance energy transfer (FRET) [45] .…”

Section: Sensing Applicationsmentioning

confidence: 99%

Graphene quantum dots: In the crossroad of graphene, quantum dots and carbogenic nanoparticles

Kelarakis

2015

Current Opinion in Colloid & Interface Science

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The scientific and technological importance of graphene quantum dots (GQDs) is directly related to their nanoscopic nature that endows remarkable photo-physical properties and colloidal stability in a variety of solvents. GQDs combine characteristics arising from their graphitic structure, their carbogenic origin and their quantum nature. They are considered as the environmentally benign alternatives of heavy metal based quantum dots, given that not only are they synthesized following green strategies, but they also exhibit minimal toxicity. GQDs are systematically explored in printing, energy harvesting, bioimaging, catalysis, optoelectronics and sensing applications.

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Recent advances in graphene quantum dots for sensing

Cited by 705 publications

References 73 publications

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

An Electrochemiluminescent Biosensor Based on Interactions between a Graphene Quantum Dot−Sulfite Co‐reactant System and Hydrogen Peroxide

Graphene quantum dots: In the crossroad of graphene, quantum dots and carbogenic nanoparticles

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