contact Sio2 ScanningTunnelingMicroscopy CuSubstrate PolyimideFilm Flake Phthalocyanine rubber Reading Pinpoint Al2O3 OrganicSemiconductor graphene_hybrid Techcomp LogAmplifier Magnetic Force Microscopy kelvin probe force microscopy ShenYang small_scan IIT-chennai fe_nd_b AdhesionEnergy Polyvinylidene_fluoride VerticalPFM Bio Conductance TiO2 atomic_steps ScanningThermalMicroscopy IISCBangalore Zhi Formamidinium_lead_iodide C_AFM Nanostructure STM