LateralPFM Holes Optoelectonics HanyangUniv PrCurve SolarCell Austenite Reading STM Cell SKPM StyreneBeads GranadaUniv Pinpoint BiasMode Gold GaAs PolymerPatterns F14H20 Array BiFeO3 Roughness PvdfFilm Polyvinylidene India HydroGel Workfunction PFM Dental PolymerBlend FrequencyModulation Lateral_Force_Microscopy polyvinyl acetate FrictionForce 2d_materials