TappingMode FrictionalForceMicroscopy fe_nd_b TiO2 Potential Monisha CuFoil Led Gallium LiftHeight molecules Optic Phenanthrene Workfunction BismuthVanadate HighResolution IMT_Bucharest Self-assembledMonolayer ScanningIon-ConductanceMicroscopy Sphere align CalciumHydroxyapatite Aggregated_molecules atomic_layer LiquidImaging ScanningThermalMicroscopy PpLdpe HardDiskMedia Hair KPFM CP-AFM dielectric trench Phase single_layer kelvin probe force microscopy