Bacterium LeakageCurrent MonoLayer Switching Monisha Croatia gallium_nitride SKPM amplitude_modulation CVD kelvin probe force microscopy MBE ThinFilm BiVO4 Conducting KPFM Scratch rubber ThermalProperties RedBloodCell Ecoli CastIron PetruPoni_Institute MfmPhase AM_KPFM Composite StrontiumTitanate OrganicCompound Ceramics silicon_carbide alkanes HydroGel Bio Wildtype ElectrostaticForceMicroscopy