MTL Annual Research Report 2011

Figure 1: (a) Morphology of monolayer graphene transferred onto quartz substrate (AFM image). AFM scan size and height bar are 5×5 µm² and 10 nm, respectively. (b) Transmittance of graphene sheets of 1 to 3 layers. As-grown LPCVD-synthesized graphene films are mostly single- layered and each additional layer contributes approximately 2.3% opacity over the range of wavelength. Inset indicates the transmittance at 550 nm as a function of the number of the graphene layers.