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Open Physics

formerly Central European Journal of Physics

Editor-in-Chief: Feng, Jonathan

Managing Editor: Lesna-Szreter, Paulina

1 Issue per year


IMPACT FACTOR 2016 (Open Physics): 0.745
IMPACT FACTOR 2016 (Central European Journal of Physics): 0.765

CiteScore 2016: 0.82

SCImago Journal Rank (SJR) 2015: 0.458
Source Normalized Impact per Paper (SNIP) 2015: 1.142

Open Access
Online
ISSN
2391-5471
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Volume 13, Issue 1 (Jan 2015)

Issues

Raman modes in transferred bilayer CVD graphene

Ahti Niilisk / Tauno Kahro
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
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/ Valter Kiisk
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
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/ Mihkel Rähn
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
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/ Harry Alles
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
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/ Jaan Aarik
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
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/ Väino Sammelselg
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
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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 : ; ; ; ;

References

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.

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

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Ahti Niilisk, Jekaterina Kozlova, Harry Alles, Jaan Aarik, and Väino Sammelselg
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[2]
Jekaterina Kozlova, Ahti Niilisk, Harry Alles, and Väino Sammelselg
Carbon, 2015, Volume 94, Page 160

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