Figure 4
From: Synthesis of flake-like graphene from nickel-coated polyacrylonitrile polymer
Raman mapping images obtained before and after Ni etching for Ni/PAN/SiO 2 /Si films pyrolyzed at 1,050°C/15 min. The coated Ni thickness is 150 nm (a, b) and 20 nm (c, d), respectively. The FE-SEM images on the very left hand side of each image set are arbitrarily selected images for the reference and do not correspond to the Raman mapping images (mapping area, 15 × 15 μm2; scale bar, 1.0 μm).