LithiumNiobate Mechanical Gallium Piezoresponse silicon_carbide LiquidImaging BariumTitanate TappingMode lift_mode Adhesive Polytetrafluoroethylene small_scan LiquidCell P3HT Morphology STM gallium_nitride Corrosion LiftHeight Permalloy Step Korea cross section SiWafer ThermalConductivity TipBiasMode ring shape AEAPDES semifluorinated alkane Formamidinium_lead_iodide STO GaN StrontiuTitanate Phosphide PinpointNanomechanicalMode