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Nickel Patterns TappingMode PDMS Roughness Polytetrafluoroethylene ConductingPolymer high_resolution Resistance CrAu HumanHair Worcester_Polytechnic_Institute organic_polymer PatternedSapphireSubstrat FrictionalForce UnivOfMaryland OrganicCompound Aggregated_molecules SingleLayer STM margarine mechanical_property MembraneFilter INSP SrO ElectrostaticForceMicroscopy HOPG Zagreb heterojunctions Filter PetruPoni_Institute UnivCollegeLondon PVA MBE TemperatureControlledAFM