kelvin probe force microscopy LifeScience Hafnia PolyStylene Electrode Switching Water Laser ScratchMode Mapping Spincast lift_mode Etch Heat StyreneBeads SSRM Chrome KPFM Polypropylene LiftHeight biocompatible ThinFilm Sapphire dielectric trench Typhimurium Display PetruPoni_Institute CopperFoil MolybdenumDisulfide Floppy SFAs Device Chromium Praseodymium PolyvinylAcetate