Dopped Graphite HumanHair IndiumTinOxide kelvin probe force microscopy HiVacuum CastIron Polytetrafluoroethylene Hexylthiophene Annealing tip_bias_mode KPFM HOPG Mapping Conduct RedBloodCell Fendb StainlessSteel LaAlO3 Vortex ThinFilm SKPM Vac 3-hexylthiophene Hysteresys FAFailureAnlaysis FM_KPFM Titanate BiFeO3 Steps Tin disulfide Defects Croatia LMF Indent