Journal
APPLIED PHYSICS LETTERS
Volume 102, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4809922
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Controllable biaxial strain is delivered to monolayer graphene prepared by chemical vapor deposition via applying an electric field to the underlying piezoelectric [Pb(Mg1/3Nb2/3)O-3] (0.7)-[PbTiO3](0.3) substrate. The effects of tunable strain on the Raman spectra of graphene are investigated in reversible and real-time manners. Such strain can result in a blue shift in 2D band of graphene. The calculations based on the Gruneisen parameter identify the actual biaxial strain to graphene, leading to a continuous 2D band shift, which is detected during the retention of bias voltage. The physical mechanism behind this unique Raman behavior is discussed. (C) 2013 AIP Publishing LLC.
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