Heat Silicon conductive Ptfe Thermoplastic_polyurethane Varistor temp BismuthVanadate Collagen self-assembled_monolayer Glass Aggregated_molecules University_of_Regensburg HfO2 Scanning_Thermal_Microscopy Domain TemperatureControllerAFM AtomicSteps FrequencyModulation PrCurve Gallium Change molecular_beam PolymerPatterns HexagonalBoronNitride EFM Writing NTU CVD SurfaceOxidation Adhesive BTO Zhi ring shape graphene_hybrid