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Reversible oxidation states of single layer graphene tuned by electrostatic potential

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Title
Reversible oxidation states of single layer graphene tuned by electrostatic potential
Author(s)
Sangku Kwon; Lee, Eui-Sup; Seo, Hyungtak; Jeon, Ki-Joon; Hwang, C.C.; Kim, Yong-Hyun; Jeong Young Park
Publication Date
2013-06
Journal
SURFACE SCIENCE, v.612, no., pp.37 - 41
Publisher
ELSEVIER SCIENCE BV
Abstract
We report the reversible oxidation and reduction of single layer graphene on a self-aligned Cu-rich CuOx layer, which was created on a Cu substrate by thermal reduction of a native Cu-oxide layer while forming graphene on top of the Cu by chemical vapor deposition. The reversible oxidation states of graphene, revealed by X-ray photoemission and Raman spectroscopies, were driven bymigration of oxygen ions in the CuOx layer under external electrostatic bias. Breaking the translational symmetry of the C\C sp2 bonds by the migrated oxygen resulted in a noticeable D band peak in the Raman spectra. However, the D band peak was not completely reduced under reverse external bias, indicating a certain level of permanent oxygen bonding on the graphene. First-principles density functional theory calculations suggested two distinct graphene\oxygen bonding configurations i.e., (1) a most-stable epoxy-like bridged oxygen and (2) a meta-stable ketone-like on-top oxygen in a four-membered ring configuration, which might be responsible for the irreversible and reversible oxidation states of graphene, respectively.
URI
https://pr.ibs.re.kr/handle/8788114/1307
ISSN
0039-6028
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
12_IBS CA1201_Surface Science_612-01_37_Reversible oxidation states of single layer graphene tuned by electrostatic potential.pdfDownload

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