heterojunctions IcelandSpar ScanningThermalMicroscopy BiFeO3 AM-KPFM Defects Aluminium_Oxide fluoroaalkane Holes PDMS MfmPhase HOPG OxideLayer Friction Mechinical Composite PolyimideFilm Device FastScan frequency_modulation LiftHeight Polypropylene Conductance PhaseChange ULCA ito_film light_emission Dr.JurekSadowski WPlug LFM NUS Ptfe LifeScience Filter FailureAnlaysis