PS_LDPE Implant PpLdpe BismuthFerrite Polyethylene WWafer HexagonalBN temperature_control Polystyrene CuFoil Resistance PatternedSapphireSubstrat ConductiveAFM InLiquid Trench Corrosion PhaseTransition BoronNitride Lateral Beads PVAC cross section Chloroform HanyangUniv Wafer PinPointMode Composite TPU exfoliate Graphene FrictionalForce Current BlockCopolymer Heating dichalcogenide