Hydroxyapatite Photovoltaics OrganicSemiconductor IcelandSpar Nanofiber OpticalWaveguide lithography dielectric trench Tungsten Varistor PiezoelectricForceMicroscopy HafniumDioxide Cell Force-distance thermal_property Polyaniline PetruPoni_Institute MagneticForceMicroscopy Biofilm DomainSwitching PtfeFilter Treatment Polyurethane PolycrystallineFerroelectricBCZT HACrystal FrictionForce pinpoint mode electrospinning bias_mode Nanostructure phase_change Friction Global_Comm CopperFoil ring shape