alkanes KPFM Phenanthrene TiO2 Fujian Hafnia SSRM C60H122 Calcite Ferrite cannabis Polytetrafluoroethylene Chungnam_National_University SKKU LateralForceMicroscopy light_emitting Hair Electrical&Electronics Conductive AFM MagneticArray PVA YszSubstrate VortexCore NiFe Force-distance IcelandSpar Workfunction Boundary block_copolymer tip_bias_mode Glass molecules CP-AFM Polyimide Polarization