Optical vertical_PFM atomic_layer AtomicLayer Polytetrafluoroethylene ScanningSpreadingResistanceMicroscopy Trench AdhesionForce Holes C60H122 kelvin probe force microscopy TungstenDeposition Sadowski IISCBangalore CancerCell NUS_NNI_Nanocore Resistance lift_mode Varistor Conductance GlassTemp ScanningKelvinProbeMicroscopy Writing Austenite BTO CuParticle HardDisk Molybdenum BFO Reduction BiFeO3 Nickel Temasek_Lab mono_layer Composite