ElectroChemical kelvin probe force microscopy Growth EFM graphene_hybrid PetruPoni HOPG 2-vinylpyridine PS_PVAC Hexacontane LeakageCurrent MagneticForceMicroscopy Writing Conductive AFM Magnetic dichalcogenide LaAlO3 Vortex Sulfur AM_KPFM solar_cell BlockCopolymer Terrace NusEce CHRYSALIS_INC Led TungstenDeposition plastic small_scan India Modulus Annealing InsulatorFilm AIN Epoxy