How are Hydroxyl Groups Localized on a Graphene Sheet?
| Autor: | Tran TT; Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, 136 Xuan Thuy Street, Cau Giay, Hanoi10000, Vietnam., Vu TC; Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, 136 Xuan Thuy Street, Cau Giay, Hanoi10000, Vietnam., Hoang HV; Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, 136 Xuan Thuy Street, Cau Giay, Hanoi10000, Vietnam., Huang WF; Institute for Energy and Climate Research, Forschungszentrum Jülich Gmbh, Jülich52428, Germany., Pham HT; Faculty of Information Technology and Center for Computational Science, Hanoi National University of Education, 136 Xuan Thuy Street, Cau Giay, Hanoi10000, Vietnam., Nguyen HMT; Faculty of Chemistry and Center for Computational Science, Hanoi National University of Education, 136 Xuan Thuy Street, Cau Giay, Hanoi10000, Vietnam. |
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| Jazyk: | angličtina |
| Zdroj: | ACS omega [ACS Omega] 2022 Oct 14; Vol. 7 (42), pp. 37221-37228. Date of Electronic Publication: 2022 Oct 14 (Print Publication: 2022). |
| DOI: | 10.1021/acsomega.2c03447 |
| Abstrakt: | Arrangements of hydroxyl groups on graphene sheets were systematically investigated using density functional theory calculations that included van der Waals interactions. Results show that hydroxyl groups tend to gather at para -positions on graphene sheets to generate perfect ring-like hexahydroxyl group adsorption. The close proximity of hydroxyl groups is in good agreement with the experimental separation between unoxidized, aromatic and oxidized, saturated regions in graphene oxide. The orientation of hydrogen atoms in hydroxyl groups creates both O-H···O and O-H···π hydrogen bonds. Calculations also indicated that the binding energy per hydroxyl group follows a logarithmic function with respect to the number of hydroxyl groups. Besides, the opening band gap was observed for several derivatives, and the relationship between the band gap and O/C ratio was found to be nonmonotonic. Analysis of the density of states showed that bands around the Fermi levels of derivatives between graphene and hydroxyl groups are mainly composed of 2p Competing Interests: The authors declare no competing financial interest. (© 2022 The Authors. Published by American Chemical Society.) |
| Databáze: | MEDLINE |
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