IIT-chennai ElectroDeposition VerticalPFM Temperature Bio Graphene Praseodymium Mapping OxideLayer PtfeMembrane HanyangUniv UnivCollegeLondon Sphere Potential Floppy Chungnam_National_University AnodizedAluminumOxide AM-KPFM AdhesionForce SmallScan PolyvinylideneFluoride IRDetector Copolymer Gallium Polytetrafluoroethylene single_layer PFM SingleCrystal Lateral_Force_Microscopy Vinylpyridine Leakage Molybdenum_disulfide 2d_materials Self-assembledMonolayer GaP