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https://hdl.handle.net/10442/17212
| Εξειδίκευση τύπου : | Άρθρο σε επιστημονικό περιοδικό |
| Τίτλος: | Ultrasonication induces oxygenated species and defects onto exfoliated graphene |
| Δημιουργός/Συγγραφέας: | Skaltsas T.
Ke X.
Bittencourt C.
[EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos |
| Ημερομηνία: | 2013 |
| Γλώσσα: | Αγγλικά |
| ISSN: | 1932-7447 |
| DOI: | 10.1021/jp4057048 |
| Περίληψη: | The effect of ultrasonication parameters, such as time and power applied, to exfoliate graphite in o-dichlorobenzene (o-DCB) and N-methyl-1,2-pyrrolidone (NMP) was examined. It was found that the concentration of graphene was higher in o-DCB, while its dispersibility was increased when sonication was applied for a longer period and/or at higher power. However, spectroscopic examination by X-ray photoelectron spectroscopy (XPS) revealed that ultrasonication causes defects and induces oxygen functional groups in the form of carboxylic acids and ethers/epoxides onto the graphene lattice. Additional proof for the latter arose from Raman, IR, and thermogravimetry studies. The carboxylic acids and ethers/epoxides onto exfoliated graphene were derived from air during ultrasonication and found independent of the solvent used for the exfoliation and the power and/or time ultrasonication applied. Quantitative evaluation of the amount of oxygenated species present on exfoliated graphene as performed by high-resolution XPS revealed that the relative oxygen percentage was higher when exfoliation was performed in NMP. Finally, the sonication time and/or power affected the oxygen content on exfoliated graphene, since extended ultrasonication resulted in a decrease in the oxygen content on exfoliated graphene, with a simultaneous increase of defected sp3 carbon atoms. |
| Τίτλος πηγής δημοσίευσης: | Journal of Physical Chemistry C |
| Τόμος/Κεφάλαιο: | 117 |
| Τεύχος: | 44 |
| Σελίδες: | 23272-23278 |
| Θεματική Κατηγορία: | [EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
[EL] Φασματοσκοπία[EN] Spectroscopy |
| Αξιολόγηση από ομότιμους (peer reviewed): | Ναι |
| Κάτοχος πνευματικών δικαιωμάτων: | © 2013 American Chemical Society. |
| Σημειώσεις: | Seventh Framework Programme, FP7: 246791 |
| Εμφανίζεται στις συλλογές: | Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο
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