Ecoli atomic_layer VerticalPFM Fluoride ForceDistanceSpectroscopy Thermoplastic_polyurethane LightEmission PetruPoni TemperatureControllerStage alkanes Switching Global_Comm DeoxyribonucleicAcid Morphology Transparent Ptfe Hydroxyapatite ReflexLens ring shape DomainSwitching Gallium_Arsenide Anneal ScanningSpreadingResistanceMicroscopy high_resolution PiezoelectricForceMicroscopy FuelCell HanyangUniv flakes MolecularSelfAssembly chemical_compound FrictionalForceMicroscopy WWafer SAM cross section Vac