Figure 3: h-BNC/graphene (h-BNC/G) heterojunctions derived from graphene single crystals.
From: Chemical and Bandgap Engineering in Monolayer Hexagonal Boron Nitride

(a) Schematic illustration of the synthesis procedure for h-BNC/G heterojunctions from a graphene single crystal with a multilayer center. (b,c) Optical images of the same graphene single crystal before and after the chemical conversion. (d) Optical image of h-BNC/G heterojunctions transferred on a 300 nm SiO2/Si substrate. (e) A corresponding room-temperature Raman spectrum of h-BNC/G heterojunctions exhibited in (d), excited with a 473 nm wavelength laser for 60 s, and the laser power is 3.3 mW.