Melt KelvinProbeForceMicroscopy Pyroelectric Collagen PvdfBead Blend HighResolution Epoxy MultiLayerCeramicCapacitor FrequencyModulation nanobar Stiffness Adhesion MagneticForce hydrocarbon Step fluorocarbon HiVacuum Polyethylene Pinpoint PFM Polytetrafluoroethylene Tape ContactModeDots Edwin Wonseok Trench thermoplastic_elastomers SFAs C_AFM AEAPDES TungstenThinFilmDeposition temp PolyStylene sputter #EC