Jason Friction chemical_compound NUS_Physics ScanningSpreadingResistanceMicroscopy OpticalWaveguide Semiconductor CaMnO3 Aluminum BreastCancerCell Hole 2dMaterials Wildtype PS_LDPE SmalScan Polystyrene CntFilm small_scan thermal_property PolymerBlend IndiumTinOxide bias_mode PyroelectricDetector HardDiskMedia oxide_layer Hexatriacontane VerticalPFM SurfaceOxidation SiWafer HafniumDioxide Thermal C_AFM Ucl ULCA atomic_steps