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Diamond (111) surfa...
Diamond (111) surface reconstruction and epitaxial graphene interface
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- Reed, B. P. (författare)
- Aberystwyth University,University of Warwick,National Physical Laboratory, UK
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- Bathen, M. E. (författare)
- ETH Zürich
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- Ash, J. W.R. (författare)
- Aberystwyth University,University of Warwick
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- Meara, C. J. (författare)
- University of Newcastle upon Tyne,University of Warwick
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- Zakharov, A. A. (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Goss, J. P. (författare)
- University of Newcastle upon Tyne
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- Wells, J. W. (författare)
- University of Oslo
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- Evans, D. A. (författare)
- Aberystwyth University
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- Cooil, S. P. (författare)
- University of Oslo,Aberystwyth University
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(creator_code:org_t)
- 2022
- 2022
- Engelska.
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Ingår i: Physical Review B. - 2469-9950. ; 105:20
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The evolution of the diamond (111) surface as it undergoes reconstruction and subsequent graphene formation is investigated with angle-resolved photoemission spectroscopy, low energy electron diffraction, and complementary density functional theory calculations. The process is examined starting at the C(111)-(2×1) surface reconstruction that occurs following detachment of the surface adatoms at 920 ∘C, and continues through to the liberation of the reconstructed surface atoms into a freestanding monolayer of epitaxial graphene at temperatures above 1000 ∘C. Our results show that the C(111)-(2×1) surface is metallic as it has electronic states that intersect the Fermi level. This is in strong agreement with a symmetrically π-bonded chain model and should contribute to resolving the controversies that exist in the literature surrounding the electronic nature of this surface. The graphene formed at higher temperatures exists above a newly formed C(111)-(2×1) surface and appears to have little substrate interaction as the Dirac point is observed at the Fermi level. Finally, we demonstrate that it is possible to hydrogen-terminate the underlying diamond surface by means of plasma processing without removing the graphene layer, forming a graphene-semiconductor interface. This could have particular relevance for doping the graphene formed on the diamond (111) surface via tuneable substrate interactions as a result of changing the terminating species at the diamond-graphene interface by plasma processing.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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