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  Carbon nanodots revised : the thermal citric acid/urea reaction

Strauß, V., Wang, H., Delacroix, S., Ledendecker, M., & Wessig, P. (2020). Carbon nanodots revised: the thermal citric acid/urea reaction. Chemical Science, 11(31), 8256-8266. doi:10.1039/D0SC01605E.

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Strauß, Volker1, Author              
Wang, Huize1, Author              
Delacroix, Simon1, Author              
Ledendecker, Marc, Author
Wessig, Pablo, Author
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1Volker Strauß, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3025555              

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 Abstract: Luminescent compounds obtained from the thermal reaction of citric acid and urea have been studied and utilized in different applications in the past few years. The identified reaction products range from carbon nitrides over graphitic carbon to distinct molecular fluorophores. On the other hand, the solid, non-fluorescent reaction product produced at higher temperatures has been found to be a valuable precursor for the CO2-laser-assisted carbonization reaction in carbon laser-patterning. This work addresses the question of structural identification of both, the fluorescent and non-fluorescent, reaction products obtained in the thermal reaction of citric acid and urea. The reaction products during autoclave-microwave reactions in the melt were thoroughly investigated in dependence of the reaction temperature and the reaction products were subsequently separated by a series of solvent extractions and column chromatography. The evolution of a green molecular fluorophore, namely HPPT, was confirmed and a full characterization on its structure and photophysical properties was conducted. The additional blue fluorescence is attributed to oligomeric ureas, which was confirmed by complementary optical and structural characterization. These two components form strong hydrogen-bond networks which eventually react to form solid, semi-crystalline particles with sizes ~7 nm and an elemental composition of 46% C, 22% N, and 29% O. The structural features and properties of all three main components were investigated in a comprehensive characterization study.

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Language(s): eng - English
 Dates: 2020-07-172020
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1039/D0SC01605E
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Title: Chemical Science
  Other : Chem. Sci.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 11 (31) Sequence Number: - Start / End Page: 8256 - 8266 Identifier: ISSN: 2041-6520