The interaction of photoexcited carbon nanodots with metal ions disclosed down to the femtosecond scale

Luisa Sciortino, Marco Cannas, Franco Mario Gelardi, Fabrizio Messina, Sciortino, Rohwer, Gazzetto, Feurer, Andrea Cannizzo, Alice Sciortino, Antonino Madonia

Risultato della ricerca: Article

18 Citazioni (Scopus)

Abstract

Fluorescent carbon nanodots are a novel family of carbon-based nanoscale materials endowed with an outstanding combination of properties that make them very appealing for applications in nanosensing, photonics, solar energy harvesting and photocatalysis. One of the remarkable properties of carbon dots is their strong sensitivity to the local environment, especially to metal ions in solution. These interactions provide a testing ground for their marked photochemical properties, highlighted by many studies, and frequently driven by charge transfer events. Here we combine several optical techniques, down to femtosecond time resolution, to understand the interplay between carbon nanodots and aqueous metal ions such as Cu2+and Zn2+. We find that copper inhibits the fluorescence of carbon dots through static and diffusional quenching mechanisms, and our measurements allow discriminating between the two. Ultrafast optical methods are then used to address the dynamics of copper-dot complexes, wherein static quenching takes place, and unveil the underlying complexity of their photocycle. We propose an initial increase of electronic charge on the surface of the dot, upon photo-excitation, followed by a partial electron transfer to the nearby ion, with 0.2 ps and 1.9 ps time constants, and finally a very fast (≪1 ps) non-radiative electron-hole recombination which brings the system back to the ground state. Notably, we find that the electron transfer stage is governed by an ultrafast water rearrangement around photo-excited dots, pointing out the key role of solvent interactions in the photo-physics of these systems.
Lingua originaleEnglish
pagine (da-a)11902-11911
Numero di pagine10
RivistaNanoscale
Volume9
Stato di pubblicazionePublished - 2017

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Metal ions
Carbon
Electrons
Copper
Quenching
Photocatalysis
Photoexcitation
Energy harvesting
Photonics
Solar energy
Ground state
Charge transfer
Physics
Fluorescence
Ions
Water
Testing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cita questo

The interaction of photoexcited carbon nanodots with metal ions disclosed down to the femtosecond scale. / Sciortino, Luisa; Cannas, Marco; Gelardi, Franco Mario; Messina, Fabrizio; Sciortino; Rohwer; Gazzetto; Feurer; Cannizzo, Andrea; Sciortino, Alice; Madonia, Antonino.

In: Nanoscale, Vol. 9, 2017, pag. 11902-11911.

Risultato della ricerca: Article

Sciortino, L, Cannas, M, Gelardi, FM, Messina, F, Sciortino, Rohwer, Gazzetto, Feurer, Cannizzo, A, Sciortino, A & Madonia, A 2017, 'The interaction of photoexcited carbon nanodots with metal ions disclosed down to the femtosecond scale', Nanoscale, vol. 9, pagg. 11902-11911.
Sciortino, Luisa ; Cannas, Marco ; Gelardi, Franco Mario ; Messina, Fabrizio ; Sciortino ; Rohwer ; Gazzetto ; Feurer ; Cannizzo, Andrea ; Sciortino, Alice ; Madonia, Antonino. / The interaction of photoexcited carbon nanodots with metal ions disclosed down to the femtosecond scale. In: Nanoscale. 2017 ; Vol. 9. pagg. 11902-11911.
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abstract = "Fluorescent carbon nanodots are a novel family of carbon-based nanoscale materials endowed with an outstanding combination of properties that make them very appealing for applications in nanosensing, photonics, solar energy harvesting and photocatalysis. One of the remarkable properties of carbon dots is their strong sensitivity to the local environment, especially to metal ions in solution. These interactions provide a testing ground for their marked photochemical properties, highlighted by many studies, and frequently driven by charge transfer events. Here we combine several optical techniques, down to femtosecond time resolution, to understand the interplay between carbon nanodots and aqueous metal ions such as Cu2+and Zn2+. We find that copper inhibits the fluorescence of carbon dots through static and diffusional quenching mechanisms, and our measurements allow discriminating between the two. Ultrafast optical methods are then used to address the dynamics of copper-dot complexes, wherein static quenching takes place, and unveil the underlying complexity of their photocycle. We propose an initial increase of electronic charge on the surface of the dot, upon photo-excitation, followed by a partial electron transfer to the nearby ion, with 0.2 ps and 1.9 ps time constants, and finally a very fast (≪1 ps) non-radiative electron-hole recombination which brings the system back to the ground state. Notably, we find that the electron transfer stage is governed by an ultrafast water rearrangement around photo-excited dots, pointing out the key role of solvent interactions in the photo-physics of these systems.",
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AU - Cannas, Marco

AU - Gelardi, Franco Mario

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AU - Sciortino, null

AU - Rohwer, null

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AU - Feurer, null

AU - Cannizzo, Andrea

AU - Sciortino, Alice

AU - Madonia, Antonino

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