TY - JOUR
T1 - Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix
AU - Agnello, Simonpietro
AU - Sciortino, Luisa
AU - Gelardi, Franco Mario
AU - Cannas, Marco
AU - Messina, Fabrizio
AU - Buscarino, Gianpiero
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
KW - Materials Science (all)
KW - Photoluminescent nanocarbons
KW - Photoluminescent silica monolith
KW - Time-resolved photoluminescence
KW - Carbon dots
KW - Materials Science (all)
KW - Photoluminescent nanocarbons
KW - Photoluminescent silica monolith
KW - Time-resolved photoluminescence
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 -