Omambac, Karim M., Hattab, Hichem, Brand, Christian, Jnawali, Giriraj ORCID: 0000-0003-0954-8614, N'Diaye, Alpha T., Coraux, Johann, van Gastel, Raoul, Poelsema, Bene, Michely, Thomas, zu Heringdorf, Frank Joachim Meyer and Horn-von Hoegen, Michael (2019). Temperature-Controlled Rotational Epitaxy of Graphene. Nano Lett., 19 (7). S. 4594 - 4601. WASHINGTON: AMER CHEMICAL SOC. ISSN 1530-6992

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Abstract

When graphene is placed on a crystalline surface, the periodic structures within the layers superimpose and moire superlattices form. Small lattice rotations between the two materials in contact strongly modify the moire lattice parameter, upon which many electronic, vibrational, and chemical properties depend. While precise adjustment of the relative orientation in the degree-and sub-degree-range can be achieved via careful deterministic transfer of graphene, we report on the spontaneous reorientation of graphene on a metallic substrate, Ir(111). We find that selecting a substrate temperature between 1530 and 1000 K during the growth of graphene leads to distinct relative rotational angles of 0 degrees, +/- 0.6 degrees, +/- 1.1 degrees, and +/- 1.7 degrees. When modeling the moire superlattices as two-dimensional coincidence networks, we can ascribe the observed rotations to favorable low -strain graphene structures. The dissimilar thermal expansion of the substrate and graphene is regarded as an effective compressive biaxial pressure that is more easily accommodated in graphene by small rotations rather than by compression.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Omambac, Karim M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hattab, HichemUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brand, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jnawali, GirirajUNSPECIFIEDorcid.org/0000-0003-0954-8614UNSPECIFIED
N'Diaye, Alpha T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Coraux, JohannUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Gastel, RaoulUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Poelsema, BeneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
zu Heringdorf, Frank Joachim MeyerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horn-von Hoegen, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-136281
DOI: 10.1021/acs.nanolett.9b01565
Journal or Publication Title: Nano Lett.
Volume: 19
Number: 7
Page Range: S. 4594 - 4601
Date: 2019
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1530-6992
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ENERGY-ELECTRON DIFFRACTION; ALKALI-METAL ADSORPTION; THERMAL-EXPANSION; DIRAC FERMIONS; GRAPHITE; GROWTH; IRIDIUM; STRAINMultiple languages
Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/13628

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