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Enhancement of island size by dynamic substrate disorder in simulations of graphene growth

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Enstone, Gwilym, Brommer, Peter, Quigley, David and Bell, Gavin R. (2016) Enhancement of island size by dynamic substrate disorder in simulations of graphene growth. Physical Chemistry Chemical Physics, 18 . pp. 15102-15109. doi:10.1039/c6cp00788k

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Official URL: http://dx.doi.org/10.1039/C6CP00788K

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Abstract

We demonstrate a new mechanism in the early stages of sub-monolayer epitaxial island growth, using Monte Carlo simulations motivated by experimental observations on the growth of graphene on copper foil. In our model, the substrate is “dynamically rough”, by which we mean (i) the interaction strength between Cu and C varies randomly from site to site, and (ii) these variable strengths themselves migrate from site to site. The dynamic roughness provides a simple representation of the near-molten state of the Cu substrate in the case of real graphene growth. Counterintuitively, the graphene island size increases when dynamic roughness is included, compared to a static and smooth substrate. We attribute this effect to destabilisation of small graphene islands by fluctuations in the substrate, allowing them to break up and join larger islands which are more stable against roughness. In the case of static roughness, when process (ii) is switched off, island growth is strongly inhibited and the scale-free behaviour of island size distributions, present in the smooth-static and rough-dynamic cases, is destroyed. The effects of the dynamic substrate roughness cannot be mimicked by parameter changes in the static cases.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Centre for Complexity Science
Faculty of Science > Engineering
Faculty of Science > Physics
Faculty of Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH): Graphene -- Research, Copper foil
Journal or Publication Title: Physical Chemistry Chemical Physics
Publisher: Royal Society of Chemistry
ISSN: 1463-9076
Official Date: 10 May 2016
Dates:
DateEvent
10 May 2016Available
3 May 2016Accepted
3 February 2016Submitted
Volume: 18
Page Range: pp. 15102-15109
DOI: 10.1039/c6cp00788k
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/H00341X/1, EP/I01358X/1

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