CNT biocompatible Composition layers ContactModeDot PolyvinylideneFluoride Lateral_Force_Microscopy NTU SiliconeOxide AM_SKPM TriGlycineSulphate DIWafer Gallium_Arsenide PhaseImaging BiasMode hetero_structure Formamidinium_lead_iodide Aluminum AM_KPFM HBN Techcomp heterojunctions OpticalWaveguide Gallium LiquidImaging ScanningTunnelingMicroscopy BismuthFerrite Film HexacontaneFilm strontiu_titanate graphene_hybrid Christmas hard_disk EFM plastics