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Formation and structural analysis of twisted bilayer graphene on Ni(111) thin flims

Iwasaki, Takayuki; Zakharov, Alexei LU ; Eelbo, Thomas; Wasniowska, Marta; Wiesendanger, Roland; Smet, Jurgen H. and Starke, Ulrich (2014) In Surface Science 625. p.44-49
Abstract
We synthesized twisted bilayer graphene on single crystalline Ni(111) thin films to analyze the statistical twist angle distribution on a large scale. The twisted bilayer graphene was formed by combining two growth methods, namely the catalytic surface reaction of hydrocarbons and carbon segregation from Ni. Low energy electron diffraction (LEED) investigations directly revealed dominant twist angles of 13 degrees, 22 degrees, 38 degrees, and 47 degrees. We show that the angle distribution is closely related to the sizes of Moire superlattices which form at commensurate rotation angles. In addition to the commensurate angles, quasi-periodic Moire structures were also formed in the vicinity of the dominant angles, confirmed by microscopic... (More)
We synthesized twisted bilayer graphene on single crystalline Ni(111) thin films to analyze the statistical twist angle distribution on a large scale. The twisted bilayer graphene was formed by combining two growth methods, namely the catalytic surface reaction of hydrocarbons and carbon segregation from Ni. Low energy electron diffraction (LEED) investigations directly revealed dominant twist angles of 13 degrees, 22 degrees, 38 degrees, and 47 degrees. We show that the angle distribution is closely related to the sizes of Moire superlattices which form at commensurate rotation angles. In addition to the commensurate angles, quasi-periodic Moire structures were also formed in the vicinity of the dominant angles, confirmed by microscopic observations with low energy electron microscopy and scanning tunneling microscopy (STM). The quasi-periodic Moire patterns are presumably caused by insufficient mobility of carbon atoms during the segregation growth while cooling. Micro-LEED studies reveal that the size of single twisted domains is below 400 nm. Atomic-scale characterization by STM indicates that the twisted layer grown by segregation is located underneath the layer grown by surface reaction, i.e. between the Ni surface and the top single-crystal graphene layer. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Twisted bilayer graphene, Surface reaction, Segregation
in
Surface Science
volume
625
pages
44 - 49
publisher
Elsevier
external identifiers
  • wos:000336355200008
  • scopus:84899747280
ISSN
0039-6028
DOI
10.1016/j.susc.2014.03.004
language
English
LU publication?
yes
id
5597c34f-8b45-4c2c-abda-4c2e06b301cb (old id 4558850)
date added to LUP
2014-07-17 13:23:38
date last changed
2017-08-20 04:06:41
@article{5597c34f-8b45-4c2c-abda-4c2e06b301cb,
  abstract     = {We synthesized twisted bilayer graphene on single crystalline Ni(111) thin films to analyze the statistical twist angle distribution on a large scale. The twisted bilayer graphene was formed by combining two growth methods, namely the catalytic surface reaction of hydrocarbons and carbon segregation from Ni. Low energy electron diffraction (LEED) investigations directly revealed dominant twist angles of 13 degrees, 22 degrees, 38 degrees, and 47 degrees. We show that the angle distribution is closely related to the sizes of Moire superlattices which form at commensurate rotation angles. In addition to the commensurate angles, quasi-periodic Moire structures were also formed in the vicinity of the dominant angles, confirmed by microscopic observations with low energy electron microscopy and scanning tunneling microscopy (STM). The quasi-periodic Moire patterns are presumably caused by insufficient mobility of carbon atoms during the segregation growth while cooling. Micro-LEED studies reveal that the size of single twisted domains is below 400 nm. Atomic-scale characterization by STM indicates that the twisted layer grown by segregation is located underneath the layer grown by surface reaction, i.e. between the Ni surface and the top single-crystal graphene layer. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Iwasaki, Takayuki and Zakharov, Alexei and Eelbo, Thomas and Wasniowska, Marta and Wiesendanger, Roland and Smet, Jurgen H. and Starke, Ulrich},
  issn         = {0039-6028},
  keyword      = {Twisted bilayer graphene,Surface reaction,Segregation},
  language     = {eng},
  pages        = {44--49},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Formation and structural analysis of twisted bilayer graphene on Ni(111) thin flims},
  url          = {http://dx.doi.org/10.1016/j.susc.2014.03.004},
  volume       = {625},
  year         = {2014},
}