Growth optoelectronics Chungnam_National_University Hexacontane Yeditepe_University NusEce plastic Scratch AM_KPFM Sidewall PVAC Conducting Magnetostrictive Friction Magnets OrganicSemiconductor kelvin probe force microscopy HydroGel Zagreb PiezoelectricForceMicroscopy organic_polymer Croatia Defect China Scanning_Thermal_Microscopy CntFilm PS_LDPE gallium_nitride PatternedSapphireSubstrat LateralForce IIT-chennai Led FrictionForce YttriaStabilizedZirconia HOPG