Tapping HighAspect NUS Roughness HiVacuum MonoLayer MolybdenumDisulfide PECurve LightEmission molecules PolyimideFilm UnivCollegeLondon pinpoint mode Barium_titanate amplitude_modulation Temasek_Lab Flake PolyStylene CrystalGrowing Defect Silver ULCA MfmPhase Pinpoint PFM ContactMode MembraneFilter optoelectronics Implant LiIonBattery Styrene Biofilm Protein CeramicCapacitor Grain tip_bias_mode