OrganicCompound FrequencyModulation PatternedSapphireSubstrat SiliconeOxide Hafnia Lanthanum_aluminate KPFM TungstenDeposition SThM exfoliate dichalcogenide Mechanical Workfunction TiO2 Resistance pinpoint mode Tungsten_disulfide Alloy piezoelectric force microscopy Tin disulfide Photovoltaics Chungnam_National_University heterojunctions NUS amplitude_modulation SrTiO3 Yeditepe_University HighResolution oxide_layer Conductivity PinpointNanomechanicalMode Dimethicone Magnetic kelvin probe force microscopy PANI