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Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method

In this study, the optical and structural properties of carbon dots (CDs) synthesized using a hydrothermal method were investigated. CDs were prepared from various precursors such as citric acid (CA), glucose, and birch bark soot. The SEM and AFM results show that the CDs are disc-shaped nanoparticl...

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Autores principales: Egorova, Marfa, Tomskaya, Aleksandra, Smagulova, Svetlana Afanasyevna
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10254426/
https://www.ncbi.nlm.nih.gov/pubmed/37297152
http://dx.doi.org/10.3390/ma16114018
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author Egorova, Marfa
Tomskaya, Aleksandra
Smagulova, Svetlana Afanasyevna
author_facet Egorova, Marfa
Tomskaya, Aleksandra
Smagulova, Svetlana Afanasyevna
author_sort Egorova, Marfa
collection PubMed
description In this study, the optical and structural properties of carbon dots (CDs) synthesized using a hydrothermal method were investigated. CDs were prepared from various precursors such as citric acid (CA), glucose, and birch bark soot. The SEM and AFM results show that the CDs are disc-shaped nanoparticles with dimensions of ~7 nm × 2 nm for CDs from CA, ~11 nm × 4 nm for CDs from glucose, and ~16 nm × 6 nm for CDs from soot. The TEM images of CDs from CA showed stripes with a distance of 0.34 nm between them. We assumed that the CDs synthesized from CA and glucose consisted of graphene nanoplates located perpendicular to the disc plane. The synthesized CDs contain oxygen (hydroxyl, carboxyl, carbonyl) and nitrogen (amino, nitro) functional groups. CDs have strong absorption in the ultraviolet region in the range of 200–300 nm. All CDs synthesized from different precursors displayed bright luminescence in the blue-green region of the spectrum (420–565 nm). We found that the luminescence of CDs depended on the synthesis time and type of precursors. The results show that the radiative transitions of electrons occur from two levels with energies ~3.0 eV and ~2.6 eV, which are due to the presence of functional groups.
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spelling pubmed-102544262023-06-10 Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method Egorova, Marfa Tomskaya, Aleksandra Smagulova, Svetlana Afanasyevna Materials (Basel) Article In this study, the optical and structural properties of carbon dots (CDs) synthesized using a hydrothermal method were investigated. CDs were prepared from various precursors such as citric acid (CA), glucose, and birch bark soot. The SEM and AFM results show that the CDs are disc-shaped nanoparticles with dimensions of ~7 nm × 2 nm for CDs from CA, ~11 nm × 4 nm for CDs from glucose, and ~16 nm × 6 nm for CDs from soot. The TEM images of CDs from CA showed stripes with a distance of 0.34 nm between them. We assumed that the CDs synthesized from CA and glucose consisted of graphene nanoplates located perpendicular to the disc plane. The synthesized CDs contain oxygen (hydroxyl, carboxyl, carbonyl) and nitrogen (amino, nitro) functional groups. CDs have strong absorption in the ultraviolet region in the range of 200–300 nm. All CDs synthesized from different precursors displayed bright luminescence in the blue-green region of the spectrum (420–565 nm). We found that the luminescence of CDs depended on the synthesis time and type of precursors. The results show that the radiative transitions of electrons occur from two levels with energies ~3.0 eV and ~2.6 eV, which are due to the presence of functional groups. MDPI 2023-05-27 /pmc/articles/PMC10254426/ /pubmed/37297152 http://dx.doi.org/10.3390/ma16114018 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Egorova, Marfa
Tomskaya, Aleksandra
Smagulova, Svetlana Afanasyevna
Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method
title Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method
title_full Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method
title_fullStr Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method
title_full_unstemmed Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method
title_short Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method
title_sort optical properties of carbon dots synthesized by the hydrothermal method
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10254426/
https://www.ncbi.nlm.nih.gov/pubmed/37297152
http://dx.doi.org/10.3390/ma16114018
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