The origin of fluorescence in carbon dots (C-dots) is still a puzzling phenomenon. The emission is, in most of the cases, due to molecular fluorophores formed in situ during the synthesis. The carbonization during C-dots processing does not allow, however, a fine control of the properties and makes finding the source of the fluorescence a challenging task. In this work, we present a strategy to embed a pre-formed fluorescent molecule, safranin O dye, into an amorphous carbonaceous dot obtained by citric acid carbonization. The dye is introduced in the melted solution of citric acid and after pyrolysis remains incorporated in a carbonaceous matrix to form red-emitting C-dots that are strongly resistant to photobleaching. Embedding dyes in amorphous C-dots represents an alternative method to optimize the emission in the whole visible spectrum.

Harnessing Molecular Fluorophores in the Carbon Dots Matrix: The Case of Safranin O / Meloni, Manuela; Stagi, Luigi; Sanna, Davide; Garroni, Sebastiano; Calvillo, Laura; Terracina, Angela; Cannas, Marco; Messina, Fabrizio; Carbonaro, Carlo Maria; Innocenzi, Plinio; Malfatti, Luca. - In: NANOMATERIALS. - ISSN 2079-4991. - 12:14(2022), p. 2351. [10.3390/nano12142351]

Harnessing Molecular Fluorophores in the Carbon Dots Matrix: The Case of Safranin O

Meloni, Manuela;Stagi, Luigi;Sanna, Davide;Garroni, Sebastiano;Innocenzi, Plinio;Malfatti, Luca
2022

Abstract

The origin of fluorescence in carbon dots (C-dots) is still a puzzling phenomenon. The emission is, in most of the cases, due to molecular fluorophores formed in situ during the synthesis. The carbonization during C-dots processing does not allow, however, a fine control of the properties and makes finding the source of the fluorescence a challenging task. In this work, we present a strategy to embed a pre-formed fluorescent molecule, safranin O dye, into an amorphous carbonaceous dot obtained by citric acid carbonization. The dye is introduced in the melted solution of citric acid and after pyrolysis remains incorporated in a carbonaceous matrix to form red-emitting C-dots that are strongly resistant to photobleaching. Embedding dyes in amorphous C-dots represents an alternative method to optimize the emission in the whole visible spectrum.
Harnessing Molecular Fluorophores in the Carbon Dots Matrix: The Case of Safranin O / Meloni, Manuela; Stagi, Luigi; Sanna, Davide; Garroni, Sebastiano; Calvillo, Laura; Terracina, Angela; Cannas, Marco; Messina, Fabrizio; Carbonaro, Carlo Maria; Innocenzi, Plinio; Malfatti, Luca. - In: NANOMATERIALS. - ISSN 2079-4991. - 12:14(2022), p. 2351. [10.3390/nano12142351]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/296528
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