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Open Physics

formerly Central European Journal of Physics

Editor-in-Chief: Feng, Jonathan

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Volume 13, Issue 1 (Jan 2015)

Issues

Raman modes in transferred bilayer CVD graphene

Ahti Niilisk
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
  • Email:
/ Tauno Kahro
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
/ Valter Kiisk
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
/ Mihkel Rähn
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
/ Harry Alles
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
/ Jaan Aarik
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
/ Väino Sammelselg
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
Published Online: 2014-10-02 | DOI: https://doi.org/10.1515/phys-2015-0003

Abstract

A systematic experimental Raman spectroscopic study of twisted bilayer graphene (tBLG) domains localized inside wide-area single layer graphene (SLG) produced by low-pressure CVD on Cu foil and transferred onto SiO2/Si substrate has been performed. According to the Raman characterization the tBLG domains had a great variety of twisting angles θ between the bottom and top graphene layers (6° < θ < 25°). The twisting angle θ was estimated from the spectral position of the rotating R and R' modes in the Raman spectrum.Under G band resonance conditions the breathing mode ZO' with a frequency of 95- 97 cm−1 was detected, and a breathing mode ZO was found in the spectra between 804 cm−1 and 836 cm−1, its position depending on the twisting angle θ. An almost linear relationship was found between the frequencies ωZO and ωR. Also a few other spectral peculiarities were found, e.g. a high-energy excitation of the G band resonance, the 2G overtone appearing at 3170-3180 cm−1 by the G band resonance, revealing a linear dispersion of 80 cm−1/eV of the 2D band in tBLG

Keywords : chemical vapour deposition; graphene; twisted bilayer; Raman spectroscopy

PACS : ; ; ; ;

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About the article

Received: 2014-03-31

Accepted: 2014-08-05

Published Online: 2014-10-02

Published in Print: 2015-01-01


Citation Information: Open Physics, ISSN (Online) 2391-5471, DOI: https://doi.org/10.1515/phys-2015-0003. Export Citation

© 2015 Ahti Niilisk et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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