dichalcogenide piezoelectric force microscopy KAIST LMF PtfeFilter Pinpoint PFM Materials Hexylthiophene PolymerBlend CeramicCapacitor ForceVolumeImage MESA structure MfmPhase Piezo Fendb PolymerPatterns atomic_layer Perovskite HOPG Hydroxyapatite Potential UnivOfMaryland MeltingPoint FAFailureAnlaysis Mechinical PolyvinylideneFluoride Ca10(PO4)6(OH)2 CeNSE_IISc Organic Gallium_Arsenide NUSNNI MoirePattern IndiumTinOxide Dimethicone Pinpoint