Reversible photon-induced oxidation of graphene by NO2 adsorption

Böttcher, Stefan; Vita, Hendrik; Horn, Karsten

doi:10.1016/j.susc.2013.11.010

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Reversible photon-induced oxidation of graphene by NO₂ 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. (2014). Reversible photon-induced oxidation of graphene by NO₂ adsorption. Surface Science, 621, 117-122. doi:10.1016/j.susc.2013.11.010.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-BBD3-1

Abstract

We show that an oxidized graphene sheet is formed by NO₂ adsorption and subsequent photodissociation, through an analysis of x-ray absorption and photoemission spectroscopic results. Adsorption of NO₂ on graphene grown on Ir(111) leads to a strong rehybridization of the unoccupied π^* states and the appearance of new features in the C 1s core level line. This is a reversible process, such that pristine graphene can be recovered by thermal treatment. The formation of oxidized graphene is sensitive to the photon-flux, resulting in an intermediate phase of oxidized graphene. Our results provide an interesting pathway towards lithographic patterning processes in graphene.