Fig. 3. Optical images and Raman spectra of single layer CVD graphene on quartz (a–c) and on the Ni film (d–f) before and after remote H2 plasma treatment at 900 °C. Red and blue spectra in (f) are representative of the Raman measurements acquired in the light (A) and dark areas (B) observed on the optical image of the Ni sample after plasma treatment (e).
