fluoroaalkane Modulus semifluorinated alkane self-assembly H-BN mechanical_property KAIST pinpoint mode INSPParis MembraneFilter PiezoelectricForceMicroscopy Ferroelectric Nanotechnology Worcester_Polytechnic_Institute high_resolution BiFeO3 C36H74 NTU PFM self_healing oxide_layer NiFe Metal Aluminum Ni81Fe19 Defect hard_disk piezoelectric force microscopy Battery amplitude_modulation lithography GaP HfO2 Edwin HexacontaneFilm