Adhesion TipBiasMode fifber self_healing Hexylthiophene FrictionalForceMicroscopy GalliumPhosphide Gallium_Arsenide temperature_control Array mechanical_property Piranha Stiffness Conductance Annealed IVSpectroscopy PUR AdhesionEnergy CaMnO3 ULCA ConductiveAFM AlkaneFilm Alloy hetero_structure Polytetrafluoroethylene AM_KPFM suspended_graphene DNAProtein StrontiuTitanate Sidewall SetpointMode WS2 lithography PetruPoni BFO