| Autor: |
Romero Aburto R, Alemany LB, Weldeghiorghis TK; ∥Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States., Ozden S, Peng Z, Lherbier A; ⊥Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain, Louvain-la-Neuve, 1348 Belgium., Botello Méndez AR; ⊥Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain, Louvain-la-Neuve, 1348 Belgium., Tiwary CS, Taha-Tijerina J, Yan Z, Tabata M, Charlier JC; ⊥Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain, Louvain-la-Neuve, 1348 Belgium., Tour JM, Ajayan PM |
| Jazyk: |
angličtina |
| Zdroj: |
ACS nano [ACS Nano] 2015 Jul 28; Vol. 9 (7), pp. 7009-18. Date of Electronic Publication: 2015 Jun 29. |
| DOI: |
10.1021/acsnano.5b01330 |
| Abstrakt: |
Here we investigated the fluorination of graphene oxide nanoribbons (GONRs) using H2 and F2 gases at low temperature, below 200 °C, with the purpose of elucidating their structure and predicting a fluorination mechanism. The importance of this study is the understanding of how fluorine functional groups are incorporated in complex structures, such as GONRs, as a function of temperature. The insight provided herein can potentially help engineer application-oriented materials for several research and industrial sectors. Direct (13)C pulse magic angle spinning (MAS) nuclear magnetic resonance (NMR) confirmed the presence of epoxy, hydroxyl, ester and ketone carbonyl, tertiary alkyl fluorides, as well as graphitic sp(2)-hybridized carbon. Moreover, (19)F-(13)C cross-polarization MAS NMR with (1)H and (19)F decoupling confirmed the presence of secondary alkyl fluoride (CF2) groups in the fluorinated graphene oxide nanoribbon (FGONR) structures fluorinated above 50 °C. First-principles density functional theory calculations gained insight into the atomic arrangement of the most dominant chemical groups. The fluorinated GONRs present atomic fluorine percentages in the range of 6-35. Interestingly, the FGONRs synthesized up to 100 °C, with 6-19% of atomic fluorine, exhibit colloidal similar stability in aqueous environments when compared to GONRs. This colloidal stability is important because it is not common for materials with up to 19% fluorine to have a high degree of hydrophilicity. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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