suspended_graphene STM Epoxy Polymer Hexylthiophene PANI Fendb atomic_layer cross section OxideLayer Silver cooling Copper ConductingPolymer food 2d_materials Mechanical Galfenol Conductivity SSRM PpLdpe Boundary SKPM Trench dielectric trench heterojunctions Thermoplastic_polyurethane Lattice HBN CVD MechanicalProperties Gallium HardDiskMedia Calcite Chungnam_National_University