Piranha Electronics Au111 Sulfur multi_layer #Materials LeakageCurrent Carbon Polyvinylidene_fluoride block_copolymer MfmPhase InsulatorFilm STM Oxide HighAspect Ito MechanicalProperty HumanHair OxideLayer Treatment exfoliate INSP Gallium Implant Hexylthiophene TemperatureControlledAFM Hole molecular_beam PetruPoni_Institute lift_mode Tungsten PDMS contact Gong Molybdenum_disulfide