NtuEee TipBiasMode MoS2 Metal-organicComplex kelvin probe force microscopy LateralPFM Christmas suspended_graphene HardDisk ThermalDetectors Graphene Force-distance STO Scanning_Thermal_Microscopy OrganicSemiconductor Chemical Vapor Deposition Potential LiquidCell PpLdpe Non-ContactMode Polyaniline SiliconOxide Zagreb Sic NanoLithography PinpointPFM H-BN FAPbI3 ShenYang Ferroelectric Morphology mechanical property Tin sulfide HiVacuum hetero_structure