We show that the Raman spectrum of graphene is sensitive to the surface chemistry of the substrate where the atomic plane is deposited. Two types of functionalized SiO 2 surface are experimentally compared: OH-terminated and NH 2 -terminated. In the case of NH 2 -terminated surface, the graphene Raman bands are signiﬁcantly redshifted with respect to the peaks observed on the hydroxylated surface. The observed phonon softening can be ascribed to a biaxial strain induced into graphene by its interaction with the substrate. Therefore, the control of the substrate surface chemistry may be envisaged as a route to graphene strain engineering.
Graphene strain tuning by control of the substrate surface chemistry / Bruna M.; Vaira A.; Battiato A.; Vittone E.; Borini S.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 97(2010). [10.1063/1.3463460]
|Titolo:||Graphene strain tuning by control of the substrate surface chemistry|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1063/1.3463460|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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