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Effect of epitaxial graphene morphology on adsorption of ambient species

Yazdi, G. Reza; Akhtar, Fatima; Ivanov, Ivan G.; Schmidt, Susann; Shtepliuk, Ivan; Zakharov, Alexei LU ; Iakimov, Tihomir and Yakimova, Rositsa (2019) In Applied surface science 486. p.239-248
Abstract

This work illustrates the impact of atmospheric gases on the surface of epitaxial graphene. The different rate of adsorption on different parts of graphene samples provides a concrete evidence that the surface morphology of graphene plays a significant role in this process. The uneven adsorption occurs only on the surface of the monolayer graphene and not on bilayer graphene. The second monolayer is distinguished and verified by the phase contrast mode of atomic force microscopy and the low energy electron microscopy, respectively. Raman spectroscopy is used to study the strain on the surface of graphene; results indicate that monolayer and bilayer graphene exhibit different types of strain. The bilayer is under more compressive strain... (More)

This work illustrates the impact of atmospheric gases on the surface of epitaxial graphene. The different rate of adsorption on different parts of graphene samples provides a concrete evidence that the surface morphology of graphene plays a significant role in this process. The uneven adsorption occurs only on the surface of the monolayer graphene and not on bilayer graphene. The second monolayer is distinguished and verified by the phase contrast mode of atomic force microscopy and the low energy electron microscopy, respectively. Raman spectroscopy is used to study the strain on the surface of graphene; results indicate that monolayer and bilayer graphene exhibit different types of strain. The bilayer is under more compressive strain in comparison with monolayer graphene that hinders the process of adsorption. However, the wrinkles and edges of steps of the bilayer are under tensile strain, hence, facilitate adsorption. Samples were subjected to X-ray photoelectron spectroscopy which confirms that the adsorbates on the epitaxial graphene are carbon clusters with nitrogen and oxygen contamination. For reversing the adsorption process the samples are annealed and a method for the removal of these adsorbates is proposed.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Adsorption, Epitaxial graphene, Strain
in
Applied surface science
volume
486
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85065813381
ISSN
0169-4332
DOI
10.1016/j.apsusc.2019.04.247
language
English
LU publication?
yes
id
e9484ad0-61f6-4e90-b5cc-d678a8bf7942
date added to LUP
2019-05-28 08:08:14
date last changed
2019-06-25 03:54:22
@article{e9484ad0-61f6-4e90-b5cc-d678a8bf7942,
  abstract     = {<p>This work illustrates the impact of atmospheric gases on the surface of epitaxial graphene. The different rate of adsorption on different parts of graphene samples provides a concrete evidence that the surface morphology of graphene plays a significant role in this process. The uneven adsorption occurs only on the surface of the monolayer graphene and not on bilayer graphene. The second monolayer is distinguished and verified by the phase contrast mode of atomic force microscopy and the low energy electron microscopy, respectively. Raman spectroscopy is used to study the strain on the surface of graphene; results indicate that monolayer and bilayer graphene exhibit different types of strain. The bilayer is under more compressive strain in comparison with monolayer graphene that hinders the process of adsorption. However, the wrinkles and edges of steps of the bilayer are under tensile strain, hence, facilitate adsorption. Samples were subjected to X-ray photoelectron spectroscopy which confirms that the adsorbates on the epitaxial graphene are carbon clusters with nitrogen and oxygen contamination. For reversing the adsorption process the samples are annealed and a method for the removal of these adsorbates is proposed.</p>},
  author       = {Yazdi, G. Reza and Akhtar, Fatima and Ivanov, Ivan G. and Schmidt, Susann and Shtepliuk, Ivan and Zakharov, Alexei and Iakimov, Tihomir and Yakimova, Rositsa},
  issn         = {0169-4332},
  keyword      = {Adsorption,Epitaxial graphene,Strain},
  language     = {eng},
  pages        = {239--248},
  publisher    = {Elsevier},
  series       = {Applied surface science},
  title        = {Effect of epitaxial graphene morphology on adsorption of ambient species},
  url          = {http://dx.doi.org/10.1016/j.apsusc.2019.04.247},
  volume       = {486},
  year         = {2019},
}