Carbon Dots from Citric Acid and its Intermediates Formed by Thermal Decomposition.
carbon dots
citric acid
decomposition pathways
fluorescence
optical properties
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
12 Sep 2019
12 Sep 2019
Historique:
received:
31
05
2019
pubmed:
30
6
2019
medline:
30
6
2019
entrez:
30
6
2019
Statut:
ppublish
Résumé
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.
Identifiants
pubmed: 31254368
doi: 10.1002/chem.201902497
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
11963-11974Subventions
Organisme : Ministero degli Affari Esteri e della Cooperazione Internazionale
ID : GINGSENG" (Grant PGR05249)
Organisme : Regione Autonoma della Sardegna
ID : Bando Capitale Umano ad Alta Qualificazione annualità 2015
Organisme : Fondazione Banco di Sardegna
ID : Bando Fondazione di Sardegna-2016
Informations de copyright
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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