Ptfe ring shape SKPM HfO2 Pinpoint PFM Calcium PhthalocyaninePraseodymium alkanes LaAlO3 SiliconCrystal PinpointPFM PinPointMode Hafnia Self-assembledMonolayer LowDensityPolyethylene OpticalWaveguide Hydroxyapatite Temasek_Lab CalciumHydroxide Hexatriacontane FrictionForce HDD Domain PrCurve Pattern ForceVolumeImage SThM Sic OrganicCompound SAM suspended_graphene Butterfly light_emission norganic dielectric_trench