热解
材料科学
光谱学
发光
光致发光
拉曼光谱
量子产额
傅里叶变换红外光谱
动态光散射
荧光光谱法
分析化学(期刊)
量子点
核化学
荧光
化学工程
有机化学
化学
纳米技术
纳米颗粒
光电子学
光学
物理
量子力学
工程类
作者
Sergei Kostromin,Anastasia Borodina,Aleksandr Podshivalov,Dmitrii Pankin,О. М. Жигалина,Sergei Bronnikov
标识
DOI:10.1080/1536383x.2023.2224467
摘要
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-counterfeiting paper for confidential documents, labels, and banknotes.
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