AIN Grain UnivCollegeLondon PolyvinylideneFluoride electrospinning Pvdf WWafer Resistance Aggregated_molecules SRAM FM_KPFM MolybdenumDisulfide STO Plug Friction Silver mfm_amplitude KelvinProbeForceMicroscopy Hole LateralForce Fluoride Vacuum CuFoil CastIron Calcium LiNbO3 Blend Corrosion organic_polymer AdhesionEnergy Polypropylene SiliconeOxide Glass NUS_NNI_Nanocore Granada