Uniaxial strain on graphene: Raman spectroscopy study and bandgap opening

Understand

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 redshifts of 2D and G band (-27.8 cm^-1 and -14.2 cm^-1per 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 bandgap at K point can be realized.