[Zurück]

H. Störi, R. Kleiner, W.S.M. Werner, R. Kolm, I. Gebeshuber, C. Jogl:
"Characterisation of monomolecular lubricant films";
in: "Proc. 14th Int. Colloquium Tribology, Vol. III", Technische Akademie Esslingen, Technische Akademie Esslingen/D, (13. - 15.1.2004), 2004, S. 1663 - 1666.

We studied the adsorption of two additives namely 8-hydroxyquinoline and ricinoleic acid from their solutions in
toluene onto pure copper under noble gas atmosphere. After adsorption the samples were transferred into the X-ray
photoelectron spectrometer, which was directly flanged to the adsorption vessel, without exposition to the environment.
There angle resolved spectra of the C 1s, N 1s, O 1s and Cu 2p photoelectrons were recorded at analyser angles of 15°,
28°, 48°, 61°, 70° and 75°. The spectra showed that the adsorption of both additives took place under noble gas
conditions. The binding of 8-hydroxyquinoline to copper resulted in a chemical shift of the 2p photoelectrons of the
atoms at the surface, which equals the shift between pure copper and copper oxide. The thickness of the adsorbed
ricinoleic acid layer was determined, using the straight line approximation, the density of the fluid and Seah and
Dench s formula to calculate the inelastic mean free path. It showed that both additives adsorbed on the substrate
formed a layer, which was less than a monolayer.

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