Fig. 4From: A graphene film interlayer for enhanced electrical conductivity in a carbon-fibre/PEEK compositeSEM images of untreated graphene thin film deposited onto (a) Si and (b) CF-PEEK substrate. Raman spectra of graphene thin film on (c) Si substrate and (d) CF-PEEK substrate with respective four Lotenzian fits to the 2D peak for (e) Si and (f) CF-PEEKBack to article page