Thermal SAM AtomicSteps OxideLayer DLaTGS HfO2 Potential Nanostructure Adhesion amplitude_modulation Treatment SrO KPFM phase_change Polystyrene PVAP3HT frequency_modulation FrictionForce 2dMaterials Calcium Silicon PolyimideFilm Melt Vac AdhesionForce CopperFoil HanyangUniv OpticalModulator MagneticForceMicroscopy Optical Graphene HighAcpectRatio Mosfet Pvdf Inorganic_Compound