MechanicalProperties FailureAnlaysis MoS2 Epoxy Piezoresponse organic_polymer HafniumDioxide lift_mode ElectroDeposition ScanningTunnelingMicroscopy HexacontaneFilm temp_control FrictionalForce self-assembled_monolayer Global_Comm heterojunctions PolyvinylAcetate VerticalPFM LeakageCurrent PetruPoni_Institute NUS_Physics 3-hexylthiophene pinpoint mode Inorganic_Compound light_emitting Collagen DataStorage NUS BiFeO3 Defects Cell SPMLabs PS_PVAC Sidewall PMNPT