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kelvin probe force microscopy Conductivity Mechanical Temperature Wang electrospinning DOE Defect PiezoelectricForceMicroscopy membrane LowDensityPolyethylene StrontiuTitanate suspended_graphene MagneticPhase BFO InsulatorFilm SmalScan LiBattery KAIST LightEmission dielectric trench Reading Beads Pvdf ThinFilm ForceMapping fe_nd_b Kevlar Conductive AFM AM-KPFM polyvinyl acetate Wildtype heterojunctions FFM light_emitting