The influence of intercalated oxygen on the properties of graphene on polycrystalline Cu under various environmental conditions

Autor(en)

Raoul Blume, Piran R. Kidambi, Bernhard C. Bayer, Robert S. Weatherup, Zhu-Jun Wang, Gisela Weinberg, Marc-Georg Willinger, Mark Greiner, Stephan Hofmann, Axel Knop-Gericke, Robert Schloegl

Abstrakt

Intercalation of oxygen at the interface of graphene grown by chemical vapour deposition and its polycrystalline copper catalyst can have a strong impact on the electronic, chemical and structural properties of both the graphene and the Cu. This can affect the oxidation resistance of the metal as well as subsequent graphene transfer. Here, we show, using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), X-ray absorption near edge spectroscopy (XANES), energy dispersive X-ray spectroscopy (EDX) and (environmental) scanning electron microscopy (ESEM) that both the oxygen intercalation and de-intercalation are kinetically driven and can be clearly distinguished from carbon etching. The obtained results reveal that a charge transfer between as grown graphene and Cu can be annulled by intercalating oxygen creating quasi-free-standing graphene. This effect is found to be reversible on vacuum annealing proceeding via graphene grain boundaries and defects within the graphene but not without loss of graphene by oxidative etching for repeated (de-) intercalation cycles.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

University of Cambridge, Massachusetts Institute of Technology, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Helmholtz-Zentrum Berlin für Materialien und Energie

Journal

Physical Chemistry Chemical Physics

Band

16

Seiten

25989-26003

Anzahl der Seiten

15

ISSN

1463-9076

DOI

https://doi.org/10.1039/c4cp04025b

Publikationsdatum

2014

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie, Physical and Theoretical Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a645fd37-4d60-449c-9f3d-3d7f83e4c81c