Conductance amplitude_modulation Tungsten_disulfide Oxidation semifluorinated_alkanes BoronNitride SPMLabs Defects 2d_materials membrane Ferrite self_assembly LeakageCurrent Hole Polyurethane Fe_film Metal AM-KPFM AtomicSteps hydrocarbon WPlug Zhi HafniumDioxide Gold KelvinProbeForceMicroscopy BlockCopolymer HOPG Growing CrystalGrowing #Materials Terrace Battery Worcester_Polytechnic_Institute SICM phase_change