Resistance NanoLithography Conductivity MBE lithography Multiferroic_materials flakes ring shape Graphene BFO norganic Vanadate Hair Polyethylene Deposition TappingMode Beads BloodCell BiasMode CuParticle Temperature SurfaceOxidation PolymerPatterns IISCBangalore organic_polymer contact Hexylthiophene HanyangUniv Liquid Biofilm C_AFM Phenanthrene Polyvinylidene Dimethicone small_scan