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Hydrogen intercalation under graphene on Ir(111)

Grånäs, Elin LU ; Gerber, Timm; Schröder, Ulrike A.; Schulte, Karina; Andersen, Jesper N. LU ; Michely, Thomas and Knudsen, Jan LU (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
organization
publishing date
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
  • scopus:84977510558
  • wos:000379105500009
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
2017-10-01 05:26:12
@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},
  keyword      = {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},
  volume       = {651},
  year         = {2016},
}