Figure 3: Optical characterisation of different Ca-doped laminates.

From: Superconductivity in Ca-doped graphene laminates

Figure 3

(ad) Photographs of Ca-RGOL and Ca-GBNLs with 25, 50 and 70 wt% BN content, respectively. Scale bars, 1 mm. (e) Reflectivity spectra for Ca-intercalated graphite and graphene laminates. (f) Out-of-plane Raman mode for different laminates. Ca-GBNL (blue) had 50 wt% of BN. The inset shows a sketch of the Ca superlattice on graphene; large yellow circles are Ca atoms and small black dots are carbon atoms.