aluminum_nitride LeakageCurrent fluoroaalkane KPFM AEAPDES thermoplastic_elastomers NUS FrictionalForceMicroscopy fluorocarbon Monisha Etch Graphene cross section Wonseok CuFoil YszSubstrate Melt blended polymers PVAP3HT DNAProtein Alkane Hole PDMS Litho Oxide semifluorinated_alkanes Optic Organic Steps Aggregated_molecules HOPG TempControl Pore ChemicalCompound Laser