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Raman modes in transferred bilayer CVD graphene

Raman modes in transferred bilayer CVD graphene 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 SiO 2 /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 ω ZO and ω R . 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Open Physics de Gruyter

Raman modes in transferred bilayer CVD graphene

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Publisher
de Gruyter
Copyright
Copyright © 2015 by the
ISSN
2391-5471
eISSN
2391-5471
DOI
10.1515/phys-2015-0003
Publisher site
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Abstract

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 SiO 2 /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 ω ZO and ω R . 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

Journal

Open Physics – de Gruyter

Published: Jan 1, 2015

References