self-assembly ElectroChemical FM_KPFM dielectric_trench fifber MonoLayer NUS_Physics norganic MechanicalProperty PVAC semifluorinated_alkane Composite medical Nanofiber Ni-FeAlloy Boron heterojunctions Layer Ananth PVAP3HT Epoxy pinpoint mode PolyimideFilm Ucl #Materials Varistor AM-KPFM NUSNNI LifeScience TappingMode BiasMode HOPG FrictionForce FM-KPFM Titanate