| Autor: |
Machado, Cláudia Emanuele, Tartuci, Letícia Gazola, de Fátima Gorgulho, Honória, de Oliveira, Luiz Fernando Cappa, Bettini, Jefferson, Pereira dos Santos, Daniela, Ferrari, Jefferson Luis, Schiavon, Marco Antônio |
| Předmět: |
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| Zdroj: |
Chemistry - A European Journal; Mar2016, Vol. 22 Issue 13, p4556-4563, 8p |
| Abstrakt: |
This work used l-tartaric acid as a model molecule to evaluate how the use of inert and oxidizing atmospheres during pyrolysis affected the physical and optical properties of the resulting carbon dots (CDs). Pyrolysis revealed to be a simple procedure that afforded CDs in a single step, dismissed the addition of organic solvents, and involved only one extraction stage that employed water. By X-ray diffraction a dependency between the structure of the CDs and the atmosphere (oxidizing or inert) used during the pyrolysis was found. Potentiometric titration demonstrated that the CDs were largely soluble in water; it also aided characterization of the various groups that contained sp3-hybridized carbon atoms on the surface of the dots. Raman spectroscopy suggested that different amounts of sp2- and sp3-hybridized carbon atoms emerged on the CDs depending on the pyrolysis atmosphere. In conclusion, the pyrolysis atmosphere influenced the physical properties, such as the composition and the final structure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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