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

Ciotta, Erica; Prosposito, P.; Tagliatesta, Pietro; Lorecchio, Chiara; Venditti, Iole; Fratoddi, Ilaria; Pizzoferrato, R.

doi:10.3390/proceedings1040475

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Within this framework, we have recently investigated [ 44 ] a novel type of graphene-like quantum dots synthesized by low-temperature oxidation and unfolding of C 60 buckminsterfullerene [ 45 ]. Due to the peculiar structure of buckminsterfullerene ÷ the carbon nanosheets synthesized with this technique have a lattice made of both hexagons and pentagons, which could give rise to a different configuration for the sp 2 domains, the content and location of defects and the functional groups.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta

Paoloni

Richetta

et al. 2017

Sensors

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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 Cu2+, Pb2+ and As(III) was observed through comparable quenching of the fluorescent emission and different variations of the transmittance spectrum. By dynamic light scattering measurements and transmission electron microscope (TEM) images 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 Pb2+ 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

Ciotta

Paoloni

Richetta

et al. 2017

Sensors

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“…Within this framework, we have recently investigated [37] a novel type of graphene-like quantum dots synthesized by low-temperature oxidation and unfolding of C60 buckminsterfullerene [38]. Due to the peculiar structure of buckminsterfullerene¸ the carbon nanosheets synthesized with this technique have a lattice made of both hexagons and pentagons, which could give rise to a different configuration for the sp 2 domains, the content and location of defects and the functional groups.…”

Section: +mentioning

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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“…Colloidal suspensions of metal NCs are characterized by a strong absorption and luminescence and these properties can be both exploited as optical sensor for environmental monitoring [24,25,26,27] or for bioimaging [28,29]. As reported recently for quantum dots of graphene oxide [30,31] the presence of contaminants can alter at the same time both the optical absorption and luminescence spectra giving a higher sensitivity and selectivity to the system. In our research we synthetized silver nanoclusters (Ag-NCs) stabilized by L-glutathione (GSH), following a previous work [32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Fluorescent Ag Nanoclusters for Sensing and Imaging Applications

Burratti

Bolli

Casalboni

et al. 2018

MSF

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Metal nanoparticles have attracted more and more attention in the last years due to their unique chemical and physical properties which are very different from the metal bulk material. In particular, when the size of nanoparticles decreases below two nm, nanoparticles can be described as nanoclusters (NCs), and they present peculiar optical properties. The excited electrons in addition to specific absorption bands show also a bright luminescence related to the quantum size effect which produce discrete energy levels. Optical properties (absorption and fluorescence) of these NCs are widely used in many different applications in science and engineering, such as chemical sensors, fluorescent probes for bio imaging or in environmental issues. In the present study, we report on the synthesis of silver nanoclusters (AgNCs) in aqueous phase using silver nitrate as precursor salt and L-Glutathione (GSH) as stabilizer. AgNCs were characterized using absorption and fluorescence spectroscopy, and transmission electron microscopy (TEM). The strong absorption and luminescence shown by these NCs are very promising for a possible exploitation both as label for bioimaging and for optical sensors for heavy metal ions.

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

Cited by 4 publications

References 11 publications

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Synthesis of Fluorescent Ag Nanoclusters for Sensing and Imaging Applications

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