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PolyvinylideneFluoride Composite ScanningTunnelingMicroscopy AtomicLayer TPU MfmAmplitude Polarization PetruPoni NtuEee SKPM Barium_titanate Composition Pattern F14H20 HighResolution PinpointPFM plastics DiffractiveOpticalElements Ecoli semifluorinated_alkane atomic_steps Wafer SingleCrystal Force-distance mechanical property Tapping Tungsten Polyaniline KelvinProbeForceMicroscopy MBE Al2O3 Gallium Pinpoint PFM ferromagnetic Chrome