PolyvinylideneFluoride Gong InsulatorFilm SingleCrystal AM-KPFM 2d_materials Polarization Strontium HexagonalBN Sulfur SAM KevlarFiber PolymerPatterns MoS2 Ucl medical OpticalWaveguide Morphology Mapping CrAu AM_KPFM I-VSpectroscopy Fiber Dopped ElectrostaticForceMicroscopy Memory StrontiuTitanate ChemicalCompound Polyaniline Cross-section MultiferroicMaterials BariumTitanate pulsed_laser_deposition LMF LiquidCrystal