Figure 5From: Synthesis of flake-like graphene from nickel-coated polyacrylonitrile polymerFE-SEM images of the Ni layers on PAN/SiO 2 /Si. After the pyrolysis at 800°C/10 min (b), 750°C/10 min (c), and 700°C/10 min (d). FE-SEM image of a pristine film is also shown in (a). Their corresponding Raman spectra of the samples after Ni etching were included in the images.Back to article page