Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix

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Abstract

We synthetized carbon dots by a pyrolitic method, and studied their photoluminescence in aqueous environment and upon trapping in a solid matrix. To this aim, we devised a facile procedure allowing to embed the dots in amorphous SiO2, without the need of any pre-functionalization of the nanoparticles, and capable of yielding a brightly photoluminescent monolith. Experimental data reveal a remarkable similarity between the emission properties of carbon dots in water and in SiO2, suggesting that the chromophores responsible of the photoluminescence undergo only weak interactions with the environment. Time-resolved photoluminescence data reveal that the typical photoluminescence tunability of these dots mostly arises, in the present case, from the co-existence of two independent emission bands. These two signals have different emission peak positions (2.8-2.9 and 2.2-2.3 eV respectively) and decay lifetimes (7.0 and 9.0 ns respectively), while their intensity ratio is controlled by the excitation wavelength.
Lingua originaleEnglish
pagine (da-a)S258-S265
Numero di pagine8
RivistaMaterials Today: Proceedings
Volume3
Stato di pubblicazionePublished - 2016

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Photoluminescence
Carbon
Chromophores
Nanoparticles
Wavelength
Water

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cita questo

@article{68fbf7e9edc5468894662bd5fd54481e,
title = "Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix",
abstract = "We synthetized carbon dots by a pyrolitic method, and studied their photoluminescence in aqueous environment and upon trapping in a solid matrix. To this aim, we devised a facile procedure allowing to embed the dots in amorphous SiO2, without the need of any pre-functionalization of the nanoparticles, and capable of yielding a brightly photoluminescent monolith. Experimental data reveal a remarkable similarity between the emission properties of carbon dots in water and in SiO2, suggesting that the chromophores responsible of the photoluminescence undergo only weak interactions with the environment. Time-resolved photoluminescence data reveal that the typical photoluminescence tunability of these dots mostly arises, in the present case, from the co-existence of two independent emission bands. These two signals have different emission peak positions (2.8-2.9 and 2.2-2.3 eV respectively) and decay lifetimes (7.0 and 9.0 ns respectively), while their intensity ratio is controlled by the excitation wavelength.",
keywords = "Carbon dots; Photoluminescent nanocarbons; Photoluminescent silica monolith; Time-resolved photoluminescence; Materials Science (all)",
author = "Gelardi, {Franco Mario} and Marco Cannas and Simonpietro Agnello and Gianpiero Buscarino and Fabrizio Messina and Luisa Sciortino",
year = "2016",
language = "English",
volume = "3",
pages = "S258--S265",
journal = "Materials Today: Proceedings",
issn = "2214-7853",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix

AU - Gelardi, Franco Mario

AU - Cannas, Marco

AU - Agnello, Simonpietro

AU - Buscarino, Gianpiero

AU - Messina, Fabrizio

AU - Sciortino, Luisa

PY - 2016

Y1 - 2016

N2 - We synthetized carbon dots by a pyrolitic method, and studied their photoluminescence in aqueous environment and upon trapping in a solid matrix. To this aim, we devised a facile procedure allowing to embed the dots in amorphous SiO2, without the need of any pre-functionalization of the nanoparticles, and capable of yielding a brightly photoluminescent monolith. Experimental data reveal a remarkable similarity between the emission properties of carbon dots in water and in SiO2, suggesting that the chromophores responsible of the photoluminescence undergo only weak interactions with the environment. Time-resolved photoluminescence data reveal that the typical photoluminescence tunability of these dots mostly arises, in the present case, from the co-existence of two independent emission bands. These two signals have different emission peak positions (2.8-2.9 and 2.2-2.3 eV respectively) and decay lifetimes (7.0 and 9.0 ns respectively), while their intensity ratio is controlled by the excitation wavelength.

AB - We synthetized carbon dots by a pyrolitic method, and studied their photoluminescence in aqueous environment and upon trapping in a solid matrix. To this aim, we devised a facile procedure allowing to embed the dots in amorphous SiO2, without the need of any pre-functionalization of the nanoparticles, and capable of yielding a brightly photoluminescent monolith. Experimental data reveal a remarkable similarity between the emission properties of carbon dots in water and in SiO2, suggesting that the chromophores responsible of the photoluminescence undergo only weak interactions with the environment. Time-resolved photoluminescence data reveal that the typical photoluminescence tunability of these dots mostly arises, in the present case, from the co-existence of two independent emission bands. These two signals have different emission peak positions (2.8-2.9 and 2.2-2.3 eV respectively) and decay lifetimes (7.0 and 9.0 ns respectively), while their intensity ratio is controlled by the excitation wavelength.

KW - Carbon dots; Photoluminescent nanocarbons; Photoluminescent silica monolith; Time-resolved photoluminescence; Materials Science (all)

UR - http://hdl.handle.net/10447/179375

UR - http://www.journals.elsevier.com/materials-today-proceedings/

M3 - Article

VL - 3

SP - S258-S265

JO - Materials Today: Proceedings

JF - Materials Today: Proceedings

SN - 2214-7853

ER -