RedBloodCell LiNbO3 TiO2 semifluorinated alkane FailureAnlaysis HexagonalBN amplitude_modulation MfmAmplitude Force-distance Wang NtuEee FrictionalForce Al2O3 Current KelvinProbeForceMicroscopy Etch contact C_AFM Steps oxide_layer TemperatureControlledAFM 2-vinylpyridine Cobalt-dopedIronOxide Ceramic Hafnium_dioxide SurfaceOxidation NUS_Physics temperature_control atomic_steps nanobar FFM FAPbI3 bias_mode Titanate light_emitting