Uniaxial Strain on Graphene: Raman Spectroscopy Study and Band-Gap Opening
- 30 October 2008
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 2 (11), 2301-2305
- https://doi.org/10.1021/nn800459e
Abstract
Graphene was deposited on a transparent and flexible substrate, and tensile strain up to ∼0.8% was loaded by stretching the substrate in one direction. Raman spectra of strained graphene show significant red shifts of 2D and G band (−27.8 and −14.2 cm−1 per 1% strain, respectively) because of the elongation of the carbon−carbon bonds. This indicates that uniaxial strain has been successfully applied on graphene. We also proposed that, by applying uniaxial strain on graphene, tunable band gap at K point can be realized. First-principle calculations predicted a band-gap opening of ∼300 meV for graphene under 1% uniaxial tensile strain. The strained graphene provides an alternative way to experimentally tune the band gap of graphene, which would be more efficient and more controllable than other methods that are used to open the band gap in graphene. Moreover, our results suggest that the flexible substrate is ready for such a strain process, and Raman spectroscopy can be used as an ultrasensitive method to determine the strain.Keywords
This publication has 20 references indexed in Scilit:
- Inducing energy gaps in monolayer and bilayer graphene: Local density approximation calculationsPhysical Review B, 2008
- Raman Studies of Monolayer Graphene: The Substrate EffectThe Journal of Physical Chemistry C, 2008
- Biased Bilayer Graphene: Semiconductor with a Gap Tunable by the Electric Field EffectPhysical Review Letters, 2007
- Substrate-induced bandgap opening in epitaxial grapheneNature Materials, 2007
- The rise of grapheneNature Materials, 2007
- Spatially Resolved Raman Spectroscopy of Single- and Few-Layer GrapheneNano Letters, 2007
- Electric Field Effect in Atomically Thin Carbon FilmsScience, 2004
- Tuning Carbon Nanotube Band Gaps with StrainPhysical Review Letters, 2003
- Electronic Structure of Deformed Carbon NanotubesPhysical Review Letters, 2000
- Uniaxial-stress effects on the electronic properties of carbon nanotubesPhysical Review B, 1997