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Temperature dependence of the 2D′ mode of an isotopically labelled graphene double layer
Author(s) -
Verhagen Tim,
Vales Vaclav,
Frank Otakar,
Kalbac Martin,
Vejpravova Jana
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600221
Subject(s) - graphene , raman spectroscopy , strain (injury) , materials science , nanometre , layer (electronics) , double layer (biology) , molecular physics , condensed matter physics , chemical physics , nanotechnology , chemistry , optics , physics , composite material , medicine
We have investigated the temperature evolution (100–300 K) of the 2D′ mode of isotopically labelled double layer graphene using in situ Raman spectro‐microscopy. The strain values obtained from the 2D′ mode analysis were confronted with those obtained from the correlation analysis of the G and 2D modes. We find that the strain landscape derived from the 2D′ mode is comparable with the one obtained from the G and 2D modes with similar temperature evolution for both layers. However; the magnitude of the strain evaluated by the two different approaches does not fully coincide, which can be attributed to the admixture of uniaxial strain to the dominant biaxial component. In addition, we observed that the 2D′ is also sensitive to the strain inhomogeneities at nanometre scale. The 2D′ mode thus serves as a valuable complementary tool for detection of the character of strain in single and double layer graphene down to helium temperatures.