A C60 ASSISTED PYRIDINE DI-N -OCTADECYLDITHIOPHOSPHATE ULTRATHIN LUBRICATING FILM, Jun Zhang*, Zhijun Zhang, Qunji Xue, Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R.China (NIST address: Building 223, Room A256, NIST, Gaithersburg, MD 20899, 301-975-4598, email:junzhang@mailserver.nist.gov)

ABSTRACT

A novel ultra_thin film of C60 assisted pyridine di_n_octadecyldithiophosphate (PyDDP) was prepared using Langmuir_Blodgett (LB) technique. The p_A isotherm exhibits that the cross_sectional area per molecule for C60/PyDDP LB film is less than that for pure C60, which is consistent with arachidic-acid/C60 LB film. The results of frictional experiments indicats that the durability of C60/PyDDP LB films is better than that of both C60 LB film and PyDDP LB film. On these bases, a model was suggested that the fullerenes may have unique lubricating properties when they are localized on the solid surface.