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GRAPHENE UNDER UNIAXIAL DEFORMATION: A RAMAN STUDY
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SYSNO ASEP 0384493 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title GRAPHENE UNDER UNIAXIAL DEFORMATION: A RAMAN STUDY Author(s) Frank, Otakar (UFCH-W) RID, ORCID
Tsoukleri, G. (GR)
Parthenios, J. (GR)
Papagelis, K. (GR)
Riaz, I. (GB)
Jalil, R. (GB)
Novoselov, K. S. (GB)
Kalbáč, Martin (UFCH-W) RID, ORCID
Kavan, Ladislav (UFCH-W) RID, ORCID
Galiotis, C. (GR)Source Title NANOCON 2011. - Ostrava : Tanger Ltd, 2011 - ISBN 978-80-87294-27-7 Pages s. 225-230 Number of pages 5 s. Publication form Print - P Action International Conference on NANOCON /3./ Event date 21.09.2011-23.09.2012 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords graphene ; strain ; Raman spectroscopy Subject RIV CG - Electrochemistry R&D Projects IAA400400804 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) IAA400400911 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) KAN200100801 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000306686700033 Annotation The presented work summarizes various aspects of uniaxial deformation in monolayer graphene studied by means of Raman spectroscopy. Graphene flakes were subjected to tension - compression uniaxial loading using the cantilever beam technique. The evolution of the Raman single-resonance (G) and double-resonance (2D) bands was monitored at strain levels < 1%. The position of all peaks redshifts under tension and blueshifts under compression. The G peak splitting into two sub-bands (G(-) and G(+)) which is caused by symmetry lowering, is observed in both strain directions. The sub-bands' intensities are used to calculate the crystal lattice orientation of the measured graphene flakes with respect to the strain axis. The nature and splitting of the 2D band even in the unstrained flakes, when excited by the 785 nm (1.58 eV) laser line, is interpreted as the interplay between two distinct double resonance scattering processes. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2013
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