||Chemical and Electronic State Analyses of Oxidizing Graphene
Takaoka, Kota ,
Mitsuhara, Kei ,
Takizawa, Masaru ,
圓谷, 志郎境, 誠司
e-Journal of Surface Science and Nanotechnology
323 , 2018-07
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.