Piezoresponse nanobar Praseodymium UnivCollegeLondon FailureAnalysis PhaseChange Polytetrafluoroethylene YszSubstrate dielectric trench conductive kelvin probe force microscopy Chloroform Calcite Conduct ThermalProperties Temasek_Lab PVAP3HT TungstenThinFilmDeposition NanoLithography PANI Plug Hysteresys ForceVolumeImage Cross-section ring shape Polyaniline amplitude_modulation Deposition DentalProsthesis Phosphide OxideLayer Perovskite FFM FloppyDisk Electical&Electronics