SurfaceChange self-assembled_monolayer FM_KPFM Optical PhaseTransition solar_cell conductive Gallium cannabidiol light_emitting PVA Heat Subhajjit Ceramics Optic Piezoelectric Yeditepe_University Ucl FrequencyModulation HACrystal AtomicLayer Bmp VortexCore light_emission ContactModeDot fe_nd_b PatternedSapphireSubstrat SFAs kelvin probe force microscopy HardDiskMedia gallium_nitride Ptfe RedBloodCell Sphere ChemicalCompound