Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye
(1) Background: This work evaluated the optical characterization of aqueous fluorescent chitosan-based carbon dots (or carbon nanoparticles CNPs) embedded in natural dye for potential functional packaging applications. Chitosan-based materials are nontoxic, biodegradable, biocompatible, bactericidal...
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MDPI AG
2024-10-01
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| Online Access: | https://www.mdpi.com/2079-6447/3/4/19 |
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| author | Sthanley R. De Lima Thiago V. Costa Tácio T. S. Santos Dora G. Felipe Teófanes B. Serna Acácio A. Andrade Viviane Pilla |
| author_facet | Sthanley R. De Lima Thiago V. Costa Tácio T. S. Santos Dora G. Felipe Teófanes B. Serna Acácio A. Andrade Viviane Pilla |
| author_sort | Sthanley R. De Lima |
| collection | DOAJ |
| description | (1) Background: This work evaluated the optical characterization of aqueous fluorescent chitosan-based carbon dots (or carbon nanoparticles CNPs) embedded in natural dye for potential functional packaging applications. Chitosan-based materials are nontoxic, biodegradable, biocompatible, bactericidal, and produced from renewable polymer sources. Anthocyanins are pigments of different colors with a large range of potential applications, such as in bioindicators and biomonitoring; (2) Methods: The CNPs were synthetized in aqueous solutions using chitosan as a carbon source. The natural dye was extracted from the leaves of <i>Tradescantia pallida</i> Purpurea in aqueous solutions. The fluorescence quantum efficiency (η) and fluorescence lifetime (τ) were determined using the mode-mismatched pump–probe thermal lens (TL) technique and time-resolved fluorescence lifetimes (TRFL) measurements, respectively; (3) Results: The η and τ were measured for CNPs embedded in natural dye solution at different concentrations (5.2, 12.09, and 21.57 mass percentage composition). The η and τ photophysical parameters obtained for CNPs embedded in natural dye were compared with those of other CNPs synthesized using different carbon sources, such as leaves, seeds, and protein; (4) Conclusions: Fluorescence spectra and time-resolved fluorescence measurements corroborate the TL results, and relatively high values of η were obtained for the CNP synthesized and embedded in natural dye. |
| format | Article |
| id | doaj-art-059570c9a14b4e3280a3c3fa6a5f920b |
| institution | DOAJ |
| issn | 2079-6447 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
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| series | Colorants |
| spelling | doaj-art-059570c9a14b4e3280a3c3fa6a5f920b2025-08-20T02:53:38ZengMDPI AGColorants2079-64472024-10-013426928110.3390/colorants3040019Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural DyeSthanley R. De Lima0Thiago V. Costa1Tácio T. S. Santos2Dora G. Felipe3Teófanes B. Serna4Acácio A. Andrade5Viviane Pilla6Grupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, BrazilGrupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, BrazilGrupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, BrazilGrupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, BrazilGrupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, BrazilGrupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, BrazilGrupo de Propriedades Ópticas e Térmicas de Materiais (GPOTM), Instituto de Física, Universidade Federal de Uberlândia—UFU, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia 38400-902, MG, Brazil(1) Background: This work evaluated the optical characterization of aqueous fluorescent chitosan-based carbon dots (or carbon nanoparticles CNPs) embedded in natural dye for potential functional packaging applications. Chitosan-based materials are nontoxic, biodegradable, biocompatible, bactericidal, and produced from renewable polymer sources. Anthocyanins are pigments of different colors with a large range of potential applications, such as in bioindicators and biomonitoring; (2) Methods: The CNPs were synthetized in aqueous solutions using chitosan as a carbon source. The natural dye was extracted from the leaves of <i>Tradescantia pallida</i> Purpurea in aqueous solutions. The fluorescence quantum efficiency (η) and fluorescence lifetime (τ) were determined using the mode-mismatched pump–probe thermal lens (TL) technique and time-resolved fluorescence lifetimes (TRFL) measurements, respectively; (3) Results: The η and τ were measured for CNPs embedded in natural dye solution at different concentrations (5.2, 12.09, and 21.57 mass percentage composition). The η and τ photophysical parameters obtained for CNPs embedded in natural dye were compared with those of other CNPs synthesized using different carbon sources, such as leaves, seeds, and protein; (4) Conclusions: Fluorescence spectra and time-resolved fluorescence measurements corroborate the TL results, and relatively high values of η were obtained for the CNP synthesized and embedded in natural dye.https://www.mdpi.com/2079-6447/3/4/19natural dyechitosan carbon dotsthermal effectsfluorescence quantum efficiencytime-resolved spectroscopy |
| spellingShingle | Sthanley R. De Lima Thiago V. Costa Tácio T. S. Santos Dora G. Felipe Teófanes B. Serna Acácio A. Andrade Viviane Pilla Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye Colorants natural dye chitosan carbon dots thermal effects fluorescence quantum efficiency time-resolved spectroscopy |
| title | Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye |
| title_full | Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye |
| title_fullStr | Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye |
| title_full_unstemmed | Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye |
| title_short | Optical Characterization of Fluorescent Chitosan-Based Carbon Dots Embedded in Aqueous Natural Dye |
| title_sort | optical characterization of fluorescent chitosan based carbon dots embedded in aqueous natural dye |
| topic | natural dye chitosan carbon dots thermal effects fluorescence quantum efficiency time-resolved spectroscopy |
| url | https://www.mdpi.com/2079-6447/3/4/19 |
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