HfO2 Aggregated_molecules Bmp Yeditepe_University NTU PiezoelectricForceMicroscopy Foil CopperFoil CalciumHydroxyapatite Cobalt-dopedIronOxide Ceramic Au111 MechanicalProperties SICM AM-KPFM Cancer Polymer Sphere Step fe_nd_b heterojunctions FrequencyModulation Polyurethane AdhesionForce blended polymers Patterns PetruPoni PhaseImaging NUSNNI MBE Mapping temperature controller AFM SiliconCrystal Nanopattern gallium_nitride