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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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Video (MPEG) (Representative movie of growth (No roughness case))
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Official URL: http://dx.doi.org/10.1039/C6CP00788K
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 | ||||||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Divisions: | Faculty of Science > Centre for Complexity Science Faculty of Science > Engineering Faculty of Science > Physics Faculty of Science > Centre for Scientific Computing |
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| 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: |
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| 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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