Nitrogen-doped carbon dots embedded in a SiO2 monolith for solid-state fluorescent detection of Cu2+ ions

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Abstract

We describe the simple fabrication of SiO2 sol-gel monoliths embedding highly luminescent carbon nanodots (CDs) sensitive to metal ions. The pristine CDs we synthesize display an intense dual emission consisting in two fluorescence bands in the green and violet region, and we demonstrate that this photoluminescence is substantially unchanged when the dots are incorporated in the SiO2 matrix. The emission of these CDs is quenched by interactions with Cu2+ ions, which can be used to detect these ions with a detection limit of 1 μM. The chromophores remain accessible to diffusing Cu2+ ions even after embedding CDs in the sol-gel monolith, where their detection capabilities are preserved. Such a result provides the proof-of-principle of a new sensing scheme, where CDs are exploited as active sensing centers of metal transition ions within a solid-state device. The different interaction mechanisms of CDs with copper, in liquid and solid phase, are analyzed in detail and discussed in terms of different accessibility of their chromophores when the dots are incorporated in the SiO2 matrix.
Lingua originaleEnglish
pagine (da-a)-
Numero di pagine6
RivistaJournal of Nanoparticle Research
Volume19
Stato di pubblicazionePublished - 2017

Fingerprint

SiO2
Nitrogen
Carbon
Ions
solid state
nitrogen
carbon
ions
Sol-gel
Chromophores
embedding
chromophores
Sol-gels
Sensing
Metals
gels
Solid state devices
solid state devices
Detection Limit
Photoluminescence

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Condensed Matter Physics
  • Materials Science(all)
  • Modelling and Simulation
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics

Cita questo

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title = "Nitrogen-doped carbon dots embedded in a SiO2 monolith for solid-state fluorescent detection of Cu2+ ions",
abstract = "We describe the simple fabrication of SiO2 sol-gel monoliths embedding highly luminescent carbon nanodots (CDs) sensitive to metal ions. The pristine CDs we synthesize display an intense dual emission consisting in two fluorescence bands in the green and violet region, and we demonstrate that this photoluminescence is substantially unchanged when the dots are incorporated in the SiO2 matrix. The emission of these CDs is quenched by interactions with Cu2+ ions, which can be used to detect these ions with a detection limit of 1 μM. The chromophores remain accessible to diffusing Cu2+ ions even after embedding CDs in the sol-gel monolith, where their detection capabilities are preserved. Such a result provides the proof-of-principle of a new sensing scheme, where CDs are exploited as active sensing centers of metal transition ions within a solid-state device. The different interaction mechanisms of CDs with copper, in liquid and solid phase, are analyzed in detail and discussed in terms of different accessibility of their chromophores when the dots are incorporated in the SiO2 matrix.",
keywords = "Carbon dots; Functional materials; Photoluminescence; Ratiometric sensor; Sensor; Bioengineering; Atomic and Molecular Physics, and Optics; Chemistry (all); Modeling and Simulation; Materials Science (all); Condensed Matter Physics",
author = "Gelardi, {Franco Mario} and Marco Cannas and Simonpietro Agnello and Gianpiero Buscarino and Fabrizio Messina and Luisa Sciortino",
year = "2017",
language = "English",
volume = "19",
pages = "--",
journal = "Journal of Nanoparticle Research",
issn = "1388-0764",
publisher = "Springer Netherlands",

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TY - JOUR

T1 - Nitrogen-doped carbon dots embedded in a SiO2 monolith for solid-state fluorescent detection of Cu2+ ions

AU - Gelardi, Franco Mario

AU - Cannas, Marco

AU - Agnello, Simonpietro

AU - Buscarino, Gianpiero

AU - Messina, Fabrizio

AU - Sciortino, Luisa

PY - 2017

Y1 - 2017

N2 - We describe the simple fabrication of SiO2 sol-gel monoliths embedding highly luminescent carbon nanodots (CDs) sensitive to metal ions. The pristine CDs we synthesize display an intense dual emission consisting in two fluorescence bands in the green and violet region, and we demonstrate that this photoluminescence is substantially unchanged when the dots are incorporated in the SiO2 matrix. The emission of these CDs is quenched by interactions with Cu2+ ions, which can be used to detect these ions with a detection limit of 1 μM. The chromophores remain accessible to diffusing Cu2+ ions even after embedding CDs in the sol-gel monolith, where their detection capabilities are preserved. Such a result provides the proof-of-principle of a new sensing scheme, where CDs are exploited as active sensing centers of metal transition ions within a solid-state device. The different interaction mechanisms of CDs with copper, in liquid and solid phase, are analyzed in detail and discussed in terms of different accessibility of their chromophores when the dots are incorporated in the SiO2 matrix.

AB - We describe the simple fabrication of SiO2 sol-gel monoliths embedding highly luminescent carbon nanodots (CDs) sensitive to metal ions. The pristine CDs we synthesize display an intense dual emission consisting in two fluorescence bands in the green and violet region, and we demonstrate that this photoluminescence is substantially unchanged when the dots are incorporated in the SiO2 matrix. The emission of these CDs is quenched by interactions with Cu2+ ions, which can be used to detect these ions with a detection limit of 1 μM. The chromophores remain accessible to diffusing Cu2+ ions even after embedding CDs in the sol-gel monolith, where their detection capabilities are preserved. Such a result provides the proof-of-principle of a new sensing scheme, where CDs are exploited as active sensing centers of metal transition ions within a solid-state device. The different interaction mechanisms of CDs with copper, in liquid and solid phase, are analyzed in detail and discussed in terms of different accessibility of their chromophores when the dots are incorporated in the SiO2 matrix.

KW - Carbon dots; Functional materials; Photoluminescence; Ratiometric sensor; Sensor; Bioengineering; Atomic and Molecular Physics, and Optics; Chemistry (all); Modeling and Simulation; Materials Science (all); Condensed Matter Physics

UR - http://hdl.handle.net/10447/288454

M3 - Article

VL - 19

SP - -

JO - Journal of Nanoparticle Research

JF - Journal of Nanoparticle Research

SN - 1388-0764

ER -