kelvin probe force microscopy Workfunction Fiber ULCA ChemicalCompound Conduct FrictionalForce Polyimide Lattice Solution PolymerPatterns Tapping LiNbO3 Topography PinpointPFM mfm_amplitude ThermalProperties TriGlycineSulphate Sapphire Hafnium_dioxide strontiu_titanate PhaseTransition Wildtype HiVacuum PinPointMode Cancer GaN PolyvinylideneFluoride FrictionalForceMicroscopy SrTiO3 molecular_beam PANI ScratchMode Formamidinium_lead_iodide OpticalWaveguide