FrictionalForce SurfaceOxidation Polytetrafluoroethylene 3-hexylthiophene HDD INSPParis ShenYang WWafer Tin disulfide amplitude_modulation Polyurethane FAFailureAnlaysis Conductive AFM Cobalt-dopedIronOxide molecule Boundary InorganicCompound Oxidation Yeditepe_University YszSubstrate Led Zhi Fiber Materials CrystalGrowing Silver ForceMapping Edwin Crystal Aggregated_molecules PinPointMode Mechanical&nanotechnology Gold Gallium HardDiskMedia