Potential Gallium 2-vinylpyridine Lateral_Force_Microscopy NTU non_contact SKKU Tin sulfide Oxidation Ptfe Zhi Permalloy GaAs LightEmiting Adhesion dielectric trench chemical_compound PhaseTransition FrequencyModulation Conductive AFM OpticalWaveguides Cobalt Yttria_stabilized_Zirconia Hair NUS_Physics small_scan WPlug dichalcogenide heterojunctions Dopped Aluminium_Oxide 2d_materials cross section Flake StrontiuTitanate