(1) 7.5 x 3.5 um PeakForce-KPFM scan (Bruker, Multimode 8) of graphene folds on a silicon substrate with Adama 80 N/m Super Sharp probe. A bright vertical band is visible in both the adhesion (Middle) and surface potential (Bottom) images but not topography (Top). The higher surface potential may be attributed to weaker bonding between the graphene and the substrate in this region. (Sample: Georg Duesberg, Trinity College Dublin).
{}