mechanical_property Polymer Techcomp Layer CuFoil HOPG ContactModeDot ForceMapping PiezoelectricForceMicroscopy CrAu self-assembled_monolayer suspended_graphene Polyaniline Indent Galfenol MechanicalProperties Conduct Vacuum PinpointNanomechanicalMode Fe_film TipBiasMode Leakage CP-AFM Phenanthrene SKKU SiliconeOxide Polytetrafluoroethylene Chloroform Steps amplitude_modulation Blend PFM Calcium GlassTemperature PpLdpe