Effect of a Balanced Concentration of Hydrogen on Graphene CVD Growth

Figure 7

AFM image of the graphene transferred on top of Si/SiO₂. The lobes of the crystal can be distinguished. The roughness reveals good homogeneity and absence of second layer growth. Some cracks are introduced by the transfer process. The white spots are impurities introduced by the PMMA, difficult to get completely cleaned. In the up part we see the profile of a 1 1 μm area (the indicated square) with RMS roughness = 0,78 nm.