NCM\ Scanning_Thermal_Microscopy suspended_graphene PetruPoni_Institute multi_layer Mechanical&nanotechnology LiquidCell Domain Singapore Tin disulfide SiliconOxide Phosphide SPMLabs FAFailureAnlaysis Reading non_contact Pinpoint PFM STO Glass TappingMode Resistance PinPointMode Ni-FeAlloy hetero_structure ring shape PANI KAIST Pattern Wildtype CuSubstrate medical Hexatriacontane PolyvinylAcetate Sadowski HOPG