PolyvinylideneFluoride Genetic GlassTemp ring shape PUR AmplitudeModulation SurfaceChange BFO GaN UnivOfMaryland SFAs Gong PvdfBead Cobalt Phthalocyanine Conductive AFM Sio2 Carbon Chungnam_National_University CopperFoil FFM Current HanyangUniv AAO FM_SKPM CrAu AdhesionForce SiliconOxide vertical_PFM chemical_compound 3-hexylthiophene Styrene Ferrite Platinum TempControl