Low-temperature anharmonic phonon properties of supported graphene

Temperature-dependent Raman studies of anharmonic phonon-phonon processes in supported graphene are presented. Different G peak position temperature dependencies for graphene on glass and copper substrates were observed. Having calculated graphene-substrate total interaction energy taking into accou...

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Bibliographic Details
Published in:Carbon (New York) 2017-01, Vol.111, p.587-591
Main Authors: Kolesov, E.A., Tivanov, M.S., Korolik, O.V., Saad, A.M., Komissarov, I.V.
Format: Article
Language:English
Subjects:
Absolute zero
Anharmonicity
Copper
Glass
Graphene
Low temperature
Substrates
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Summary:Temperature-dependent Raman studies of anharmonic phonon-phonon processes in supported graphene are presented. Different G peak position temperature dependencies for graphene on glass and copper substrates were observed. Having calculated graphene-substrate total interaction energy taking into account substrate-induced strain, we estimated E2g mode energy changes due to anharmonic phonon-phonon interaction as the temperature decreases from room temperature to a value close to absolute zero for both substrates. For graphene on glass, the obtained value was about 1.8 times greater than the theoretical one for suspended graphene. For graphene on copper, the value was about 2.9 times greater. This result demonstrates a strong substrate influence on anharmonic phonon-phonon processes in graphene. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2016.10.020