Flake FM-KPFM Composition Hexacontane Fendb PDMS HOPG Piezoresponse DomainSwitching Plug ULCA AdhesionEnergy FuelCell Korea Hair mfm_amplitude Heating PolyimideFilm 2-vinylpyridine align PolymerPatterns SolarCell F14H20 Conductivity semifluorinated alkane Mfm Subhajjit TransitionMetal Tin sulfide Adhesion nanobar semifluorinated_alkanes UTEM Cross-section DIWafer