柠檬酸
热分解
荧光
化学
分解
光化学
碳纤维
X射线光电子能谱
猝灭(荧光)
荧光光谱法
化学工程
材料科学
无机化学
有机化学
物理
量子力学
复合数
工程类
复合材料
作者
Róbert Ludmerczki,Stefania Mura,Carlo Maria Carbonaro,István M. Mándity,Massimo Carraro,Nina Senes,Sebastiano Garroni,Gaetano Granozzi,Laura Calvillo,Sergio Marras,Luca Malfatti,Plinio Innocenzi
标识
DOI:10.1002/chem.201902497
摘要
Abstract Thermal decomposition of citric acid is one of the most common synthesis methods for fluorescent carbon dots; the reaction pathway is, however, quite complex and the details are still far from being understood. For instance, several intermediates form during the process and they also give rise to fluorescent species. In the present work, the formation of fluorescent C‐dots from citric acid has been studied as a function of reaction time by coupling infrared analysis, X‐ray photoelectron spectroscopy, liquid chromatography/mass spectroscopy (LC/MS) with the change of the optical properties, absorption and emission. The reaction intermediates, which have been identified at different stages, produce two main emissive species, in the green and blue, as also indicated by the decay time analysis. C‐dots formed from the intermediates have also been synthesised by thermal decomposition, which gave an emission maximum around 450 nm. The citric acid C‐dots in water show short temporal stability, but their functionalisation with 3‐aminopropyltriethoxysilane reduces the quenching. The understanding of the citric acid thermal decomposition reaction is expected to improve the control and reproducibility of C‐dots synthesis.
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