Effect of a Balanced Concentration of Hydrogen on Graphene CVD Growth

Figure 3

(a) Polycrystalline copper foil before (up piece) and after (down piece) the hydrogen etching. The difference in the surface color indicates the deoxidation of it. The red line indicates 4 cm. EBSD maps of (b) the as-received polycrystalline copper foil (scale bar 50 μm), (c) the foil after plasma annealing and 20 minutes graphene growth at 1040°C, (scale bar 100 μm), and (d) the foil after plasma annealing and 50 minutes graphene growth (scale bar 200 μm). The triangle palette matches the copper facets orientation with the relative color and is common for all three maps.

(a)

(b)

(c)

(d)