Universität zu Köln

Granas, Elin ORCID: 0000-0001-5247-7589, Gerber, Timm, Schroeder, Ulrike A., Schulte, Karina, Andersen, Jesper N., Michely, Thomas and Knudsen, Jan (2016). Hydrogen intercalation under graphene on Ir(111). Surf. Sci., 651. S. 57 - 62. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1879-2758

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Abstract

Using high resolution X-ray photoelectron spectroscopy and scanning tunneling microscopy we study the intercalation of hydrogen under graphene/Ir(111). The hydrogen intercalated graphene is characterized by a component in C 1s that is shifted-0.10 to-0.18 eV with respect to pristine graphene and a component in Ir 4f at 60.54 eV. The position of this Ir 41 component is identical to that of the Ir(111) surface layer with hydrogen atoms adsorbed, indicating that the atomic hydrogen adsorption site on bare Ir(111) and beneath graphene is the same. Based on co-existence of fully- and non-intercalated graphene, and the inability to intercalate a closed graphene film covering the entire Ir(111) surface, we conclude that hydrogen dissociatively adsorbs at bare Ir(111) patches, and subsequently diffuses rapidly under graphene. A likely entry point for the intercalating hydrogen atoms is identified to be where graphene crosses an underlying Ir(111) step. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Granas, Elin UNSPECIFIED orcid.org/0000-0001-5247-7589 UNSPECIFIED Gerber, Timm UNSPECIFIED UNSPECIFIED UNSPECIFIED Schroeder, Ulrike A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schulte, Karina UNSPECIFIED UNSPECIFIED UNSPECIFIED Andersen, Jesper N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Knudsen, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-266119
DOI:	10.1016/j.susc.2016.03.002
Journal or Publication Title:	Surf. Sci.
Volume:	651
Page Range:	S. 57 - 62
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1879-2758
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ADSORPTION; OXIDATION; SURFACE; CO Multiple languages Chemistry, Physical; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26611