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Photon-induced oxidation of graphene/Ir(111) by SO2 adsorption

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Böttcher,  Stefan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Vita,  Hendrik
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Horn,  Karsten
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Böttcher, S., Vita, H., & Horn, K. (2015). Photon-induced oxidation of graphene/Ir(111) by SO2 adsorption. Surface Science, 641, 305-309. doi:10.1016/j.susc.2015.02.003.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-C012-3
Abstract
We prepare a single layer of graphene oxide by adsorption and subsequent photo-dissociation of SO2 on graphene/Ir(111). Epoxidic oxygen is formed as the main result of this process on graphene, as judged from the appearance of characteristic spectroscopic features in the C 1s and O 1s core level lines. The different stages of decomposition of SO2 into its photo-fragments are examined during the oxidation process. NEXAFS at the carbon K edge reveals a strong disturbance of the graphene backbone after oxidation and upon SO adsorption. The oxide phase is stable up to room temperature, and is fully reversible upon annealing at elevated temperatures. A band gap opening of 330 ± 60 meV between the valence and conduction bands is observed in the graphene oxide phase.