Guilhon I, Bechstedt F, Botti S, Marques M, Teles LK (2017)
Publication Type: Journal article
Publication year: 2017
Book Volume: 95
Article Number: 245427
Journal Issue: 24
DOI: 10.1103/PhysRevB.95.245427
We study the incomplete oxidation of graphene or reduction of graphene oxide for hydroxyl and epoxy oxidant groups. While in wet oxidation hydroxyl groups are favorable, in a drier environment an oxygen atom can bridge two neighboring carbon atoms. We model composition variations and structural disorder within a statistical theory, the generalized quasichemical approximation, combined with density functional theory calculations of the local atomic geometries. A generalization of the statistical approach is developed to account for the antiparallel orientation of hydroxyl groups and a fourfold coordination of C atoms. The theoretical framework enables a thermodynamic treatment of graphene oxide as a function of oxygen content, allowing us to derive temperature-composition phase diagrams and investigate possible clustering and segregation. The resulting geometries, local and average electronic structures, and optical absorption spectra are discussed and compared with available experimental data.
APA:
Guilhon, I., Bechstedt, F., Botti, S., Marques, M., & Teles, L.K. (2017). Thermodynamic, electronic, and optical properties of graphene oxide: A statistical ab initio approach. Physical Review B, 95(24). https://doi.org/10.1103/PhysRevB.95.245427
MLA:
Guilhon, I., et al. "Thermodynamic, electronic, and optical properties of graphene oxide: A statistical ab initio approach." Physical Review B 95.24 (2017).
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