Ca10(PO4)6(OH)2 Phosphide Boundary PVAP3HT piezoelectric force microscopy SThM SKPM Subhajjit Magnetostrictive IMT_Bucharest MfmAmplitude LFM Phase Corrosion Silicon Plug Current 2d_materials ItoGlass InsulatorFilm AM-KPFM medical ConductingPolymer membrane fluoroalkane NTU PatternedSapphireSubstrat TiO2 Forevision SPMLabs P3HT cross section AdhesionForce Non-ContactMode Pore