Journal Article Chemical and Electronic State Analyses of Oxidizing Graphene

Takaoka, Kota  ,  Mitsuhara, Kei  ,  Takizawa, Masaru  ,  圓谷, 志郎  ,  境, 誠司

In order to investigate the process of oxidizing graphene, the chemical and electronic states have been studied by X-ray absorption fine structure (XAFS) and photoelectron spectroscopy (PES) measurements. Single layer graphene oxide was formed on sapphire(0001). After oxidation until 30s, XAFS results showed a decrease of C pi* intensity and an appearance of O pi* intensity and PES results showed a similar electronic state. However, 45s oxidation leaded to a different electronic state, and the O pi* intensity decreased for 60s oxidation. The oxidation is thought to firstly introduce the oxygen functional groups, then to modify the graphene.

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