DOE CVD Beads PolyvinylideneFluoride block_copolymer Indent ScanningIon-ConductanceMicroscopy Ucl ShenYang Ni81Fe19 MoirePattern Self-assembledMonolayer single_layer HanyangUniv LateralForceMicroscopy Graphene FrictionalForceMicroscopy MfmAmplitude PetruPoni_Institute Techcomp VerticalPFM Led Global_Comm atomic_steps PANI Roughness nanobar Austenite Ito PtfeMembrane Floppy suspended_graphene HBN Sperm Adhesive