light_emitting molecular_beam KPFM high_resolution Ucl INSP Inorganic IIT-chennai India Pore Genetic block_copolymer BiasMode HafniumDioxide Holes StainlessSteel Nanofiber ScanningKelvinProbeMicroscopy Corrosion margarine Ferroelectric Collagen frequency_modulation VerticalPFM Film TCS TemperatureControllerAFM Lift atomic_steps ring shape SFAs PolyvinylAcetate Plug heterojunctions GalliumPhosphide