ScanningTunnelingMicroscopy SKPM TyphimuriumBiofilm molecular_beam domain_switching BFO Vac kelvin probe force microscopy light_emission HACrystal Glass CHRYSALIS_INC Optical Metal Pores LightEmiting silicon_carbide NUS Polytetrafluoroethylene medical Steps DLaTGS Tungsten_disulfide SThM ContactMode Vinylpyridine INSP PS_PVAC Writing KevlarFiber Temperature ring shape Polyvinylidene_fluoride FailureAnlaysis 2d_materials