Dopped PolyvinylideneFluoride ContactMode Ucl #Materials Film piezoelectric force microscopy SKPM TemperatureControllerAFM Mobile MetalCompound WPlug Calcium PinPointMode SingleLayer SurfaceChange NUS NUS_Physics PinpointPFM pinpoint mode Melt Inorganic_Compound Chungnam_National_University Vortex norganic HexagonalBoronNitride Graphite Polystyrene self_healing hydrocarbon graphene_hybrid BFO Regensburg cross section Memory