Sidewall PvdfBead FrictionalForceMicroscopy LiquidImaging TriGlycineSulphate small_scan polyvinyl acetate BiasMode ContactMode SrTiO3 UnivOfMaryland HydroGel StainlessSteel pinpoint mode CP-AFM Metal-organicComplex ConductiveAFM Hexylthiophene Logo NUS Lanthanum_aluminate molecular_self_assembly UnivCollegeLondon Nickel bias_mode 2dMaterials dichalcogenide Corrosion fifber MagneticForceMicroscopy Tungsten KPFM OpticalWaveguide DIWafer Christmas