PDMS PiezoelectricForceMicroscopy STM Ni81Fe19 SKKU FloppyDisk NtuEee Formamidinium_lead_iodide NUS_Physics DLaTGS non_contact Polymer Sapphire Ito ThermalConductivity MembraneFilter PtfeFilter LightEmission Memory Sadowski Defect Tapping IISCBangalore MultiferroicMaterials Oxide MetalCompound PolyvinylideneFluoride Regensburg SAM molecule Nanotechnology CrAu semifluorinated_alkane OpticalWaveguide MoS2