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SolarCell ScanningSpreadingResistanceMicroscopy Vanadate molecule Etch Ceramics NtuEee bias_mode lithography Barium_titanate HumanHair molecular_self_assembly AAO PhaseImaging DNA Materials Chungnam_National_University TemperatureControllerAFM Pinpoint PFM BFO small_scan Sidewall ring shape AM_KPFM OrganicCompound suspended_graphene LogAmplifier InorganicCompound kelvin probe force microscopy IVSpectroscopy Cancer Optical Mobile Sphere Foil