PinpointPFM non_contact molecular_self_assembly HACrystal CVD contact HanyangUniv Kevlar NUSNNI BariumTitanate SoftSample FrequencyModulation Pvdf PolymerPatterns NtuEee hard_disk HardDisk Mapping GaN molecules Annealed electrospinning Thermoplastic_polyurethane PvdfBead PhaseChange Gallium_Arsenide Polymer Molybdenum_disulfide Phenanthrene self-assembly SelfAssembly Fiber molecule SicMosfet Morphology