vertical_PFM semifluorinated_alkanes self_healing InLiquid HBN AM-KPFM ForceVolumeMapping Conductance Bio Switching LateralPFM PVAC Foil Laser Ecoli Corrosion Current oxide_layer CeNSE_IISc Solar SiliconeOxide TipBiasMode InorganicCompound FrequencyModulation Flake ThermalConductivity Techcomp BFO Molybdenum Terrace chemical_compound Phase Optic ContactMode Vanadate