The PMMA solution was spin-coated onto CVD-Graphene at 2000 rpm for 2 minutes. After drying SEM measurements were performed on a Teneo SEM instrument operating at 1 kV and working distances of 5-8 mm. The powder X-ray diffraction data were collected at a Bruker D8 Discover diffractometer with a Lynxeye XE detector, operated at 40 kV and 400 mA under Cu Kα radiation (λ = 1.5406 Å) at ambient temperature and pressure. Bright-field TEM images and SAED images were obtained with a FEI Tecnai G2 Spirit Twin microscope operated at 120 kV.