heterojunctions SingleLayer Barium_titanate Temasek_Lab HafniumDioxide PtfeMembrane PvdfBead PolyvinylAcetate Ucl Perovskite Non-ContactMode Molybdenum LiquidCrystal SAM Logo self-assembly ScanningTunnelingMicroscopy high_resolution light_emitting PS_PVAC Praseodymium Zhi Hafnia GaN FuelCell PolyimideFilm Battery Polytetrafluoroethylene MultiferroicMaterials hard_disk_media VortexCore Gallium HDD Celebration ElectroChemical