graphene_hybrid FM-KPFM PinPointMode HanyangUniv Varistor PDMS Conductivity Yttria_stabilized_Zirconia FrictionalForceMicroscopy align Liquid Ni-FeAlloy SicMosfet Grain polymeric_arrays medical Defect Laser Aluminium_Oxide Moire PvdfFilm self-assembly semifluorinated alkane heterojunctions FAPbI3 AM_KPFM Wonseok Force-distance cross section #EC Indent Piezoelectric NUSNNI Lanthanum_aluminate Sio2