Magnetic Force Microscopy Layer StyreneBeads IIT-chennai GaN C60H122 organic_polymer Piezoelectric ElectroChemical Wildtype Materials Electrical&Electronics vertical_PFM ScanningSpreadingResistanceMicroscopy Growth gallium_nitride Non-ContactMode Solution Cobalt SKKU TPU Nanopattern NUSNNI Cell Mapping Heating Current Foil Annealed Pyroelectric C_AFM Scanning_Thermal_Microscopy FAPbI3 ForceDistanceSpectroscopy self_healing