Hydrogen intercalation under graphene on Ir(111)
(2016) In Surface Science 651. p.57-61- 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 4f 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... (More)
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 4f 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.
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- author
- Grånäs, Elin LU ; Gerber, Timm ; Schröder, Ulrike A. ; Schulte, Karina ; Andersen, Jesper N. LU ; Michely, Thomas and Knudsen, Jan LU
- organization
- publishing date
- 2016-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Edge atoms, Graphene, Hydrogen, Intercalation, Scanning tunneling microscopy, X-ray photoemission spectroscopy
- in
- Surface Science
- volume
- 651
- pages
- 5 pages
- publisher
- Elsevier
- external identifiers
-
- wos:000379105500009
- scopus:84977510558
- ISSN
- 0039-6028
- DOI
- 10.1016/j.susc.2016.03.002
- language
- English
- LU publication?
- yes
- id
- f0445d3f-20c8-4301-a51d-cf0d40488557
- date added to LUP
- 2016-11-23 08:45:10
- date last changed
- 2024-03-22 12:06:18
@article{f0445d3f-20c8-4301-a51d-cf0d40488557,
abstract = {{<p>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 4f 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.</p>}},
author = {{Grånäs, Elin and Gerber, Timm and Schröder, Ulrike A. and Schulte, Karina and Andersen, Jesper N. and Michely, Thomas and Knudsen, Jan}},
issn = {{0039-6028}},
keywords = {{Edge atoms; Graphene; Hydrogen; Intercalation; Scanning tunneling microscopy; X-ray photoemission spectroscopy}},
language = {{eng}},
month = {{09}},
pages = {{57--61}},
publisher = {{Elsevier}},
series = {{Surface Science}},
title = {{Hydrogen intercalation under graphene on Ir(111)}},
url = {{http://dx.doi.org/10.1016/j.susc.2016.03.002}},
doi = {{10.1016/j.susc.2016.03.002}},
volume = {{651}},
year = {{2016}},
}