Temasek_Lab TyphimuriumBiofilm atomic_layer DIWafer Writing Potential Defects Switching 3-hexylthiophene 2dMaterials Microchannel ContactMode Ito Graphite HACrystal HanyangUniv MolybdenumDisulfide Thermoplastic_polyurethane STM Sphere PatternedSapphireSubstrat Wafer Ni81Fe19 AtomicLayer rubber Global_Comm Vacuum vertical_PFM tip_bias_mode lithography ForceVolumeImage IVSpectroscopy Grain NusEce Polytetrafluoroethylene