Polytetrafluoroethylene CalciumHydroxyapatite InsulatorFilm Roughness exfoliate alkanes UnivCollegeLondon AtomicSteps semifluorinated_alkane Composition SICM PS_LDPE Treatment Bmp Electrical&Electronics CHRYSALIS_INC Annealed TriGlycineSulphate Force-distance VinylAlcohol DNAProtein OrganicCompound Conductivity PolymerPatterns AM_KPFM piezoelectric force microscopy Wafer LDPE CP-AFM Aluminum InorganicCompound Bacteria HexagonalBN Terrace doped