semifluorinated alkane Stiffness Yeditepe PVAC MBE Tapping AtomicLayer Pzt Mechinical Friction HanyangUniv #Materials CastIron Ptfe LateralPFM TungstenThinFilmDeposition Scratch FastScan Domain Wonseok single_layer SolarCell I-VSpectroscopy India FM_KPFM Phthalocyanine Zhi ForceVolumeImage Epoxy ConductiveAFM GalliumPhosphide BFO self_healing domain_switching PS_LDPE