HDD PolyimideFilm Adhesion atomic_steps Collagen Annealed Led vertical_PFM non_contact Epoxy Praseodymium Hole Sic Silicon CalciumHydroxide GalliumPhosphide Glass Dopped PECurve self_healing LowDensityPolyethylene Workfunction UTEM mechanical_property molecules FFM LFM piezoelectric force microscopy Vanadate Dental FrictionalForceMicroscopy Pinpoint PFM Lateral nanomechanical Perovskite