Fig. 2-3 Graphene Sheets and Crystals (IMAGE)
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Figure 2: Graphene sheets grown on top of single crystal copper foil. (Left) Very high quality single crystal monolayer graphene was obtained on single crystal copper foil, and (right) multilayer graphene (from 2 to 10 layers) on a single crystal copper-nickel alloy foil.
Figure 3: Crystals change orientation to minimize surface energy. Members of the team, DING Feng, ZHANG Leining, and DONG Jichen, contributed a model and theoretical calculations on 'colossal grain growth' that was observed and studied through experiments. SHIN Hyung-Joon drew attention to the importance of the initial "texture" of the polycrystalline metal foils and the role this plays in colossal grain growth. In the presence of large amounts of vacancies within the crystal structure (5 percent in these molecular dynamics simulation), the crystal orientation changes to minimize the surface energy.
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