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Characterization of Carbon Quantum Dots Obtained Through Citric Acid Pyrolysis by Sergei Kostromin; Anastasia Borodina; Aleksandr Podshivalov; Dmitrii Pankin; Olga Zhigalina; Sergei Bronnikov is a Materials Science article available to read on EtoBox.

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Abstract Carbon quantum dots (CQDs) were produced through citric acid (CA) pyrolysis. For the first time, we searched for the optimum CA pyrolysis duration and temperature. As a basic quality criterion of quantum dots, photoluminescence quantum yield (QY) was chosen. For this purpose, the pyrolysis products were analysed with UV–Vis spectroscopy and fluorescence (FL) spectroscopy. The optimum pyrolysis time was accepted to be 240 min, whereas the optimum pyrolysis temperature was approved as 200 °C. The pyrolysis products obtained at the optimum conditions were further subjected to dialysis. Finally, the purified CQDs were characterised with FL spectroscopy, transmission electron microscopy, dynamic light scattering, Raman spectroscopy, and Fourier transform infra-red spectroscopy. The produced CQDs were shown to be stable in water solution. Their PL QY (6.1%) was decreased to 1.2% after CQDs exposure to daylight for 90 days. Luminescent polymer composites were produced when CQDs were embedded in the poly(vinyl alcohol) and bacterial cellulose matrices. The prepared composites can be used for fabrication of transparent, flexible, and luminescent films and for production of anti-cou

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Author

Sergei Kostromin; Anastasia Borodina; Aleksandr Podshivalov; Dmitrii Pankin; Olga Zhigalina; Sergei Bronnikov

Publisher

Informa UK Limited

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)