Raman spectra and Raman mapping. (a) Typical Raman spectra for the as-grown graphene film at the locations with and without Ga2O3 flakes. (b) The Raman mapping of I2D/IG on the area marked as a white square in Figure 1a.
Zhu et al. Nanoscale Research Letters 2014 9:48 doi:10.1186/1556-276X-9-48