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Piezoelectric optoelectronics SolarCell AnodizedAluminumOxide Moire GaAs Worcester_Polytechnic_Institute Topography Strontium FM-KPFM PS_LDPE ring shape Vac Friction FM_SKPM Boundary Molybdenum Phosphide Tin disulfide ForceMapping Yttria_stabilized_Zirconia plastics Vortex hard_disk_media Titanate Materials thermoplastic_elastomers NiFe Workfunction Platinum FloppyDisk CalciumHydroxyapatite DOE LateralForce NusEce