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Number of results

Journal

2015 | 13 | 1 |

Article title

Raman modes in transferred bilayer CVD graphene

Content

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Languages of publication

EN

Abstracts

EN
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

Publisher

Journal

Year

Volume

13

Issue

1

Physical description

Dates

published
1 - 1 - 2015
online
2 - 10 - 2014
received
31 - 3 - 2014
accepted
5 - 8 - 2014

Contributors

author
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
author
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
author
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
author
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
author
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
author
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia
  • University of Tartu, Institute of Physics, Department of Materials Science, Ravila 14c, EE-50411 Tartu, Estonia

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_1515_phys-2015-0003
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