単層C_60薄膜の形成と摩擦特性

概要

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A C_60 monolayer film can grow on a graphite (Highly Oriented Pyrolitic Graphite :HOPG) substrate at a substrate temperature of 150℃. The frictional behavior of a C_60 monolayer film between graphite substrates is studied using a homebuilt surface force apparatus. The mean frictional force from the C_60 monolayers is estimated to be approximately 2mN, which is one-fifth that of C_60 multilayer films. This result indicates that C_60 molecules of the C_60 monolayer sandwiched between graphite substrates roll via the nanogears of six-membered carbon rings between C_60 molecules and the upper and lower graphite substrates. The C_60 monolayer film maintains durability with a low frictional force of 2mN for more than one hundred scans under a load of 10mN. This behavior does not change in the scan velocity range of 10 to 20 μ m/s. Hence a novel frictional mechanism is realized in the graphite substrates sandwiching a C_60 monolayer film system. It should be emphasize that the graphite substrates sandwiching a C_60 monolayer film system is very promising for the realization of nanomachines and micromachines.
2003-01-05