In order to develop new composite materials between reactive metals and polymers, it is proposed to place organic monomers at the metal/polymer phase boundary, which can be coupled by covalent/idc bonds to reactive centres of tbe metal substrate and later by covalent bonds to the polymer itself. As a Arst step, the model system iron/+ decanethiol (ndecylmercaptan, C,,H,,SH) has been investigated by AES and XPS. It is shown that the mercaptan binds to metallic clean iron surfaces through the sulphur atom, probably by cleavage of the S-H bond. The S 2p3,, peak has a binding energy of 162.4 f 0.2 eV. Anodic polarization and ageing in the laboratory atmosphere do not oxidize these chemisorbed molecules; the oxidation reactions of the substrate are suppressed too. After cyclovoltammetry (-1.0 V , , < U < + 0.6 VSH& better oriented chemisorbed molecules are packed more densely on top of the surface.

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half a monolayer (e' =0.5), corresponding to a c(2 x 2) structure (Fig. 4a) (Fig. 5a)

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Adsorption I Katalyse I ReaktionskinetikUsing a solid electrolyte cell inside an UHV-system the surface composition of oxides and metals can be studied at high temperatures 700 to 1OOO"C and well defined oxygen activities in the range po, = lo-'' to bar. AES-measurements on wustite have shown that at temperatures >8OO"C the composition of the surface shows the same change with the varied oxygen activity as would be expected for the bulk. At temperatures below 800 "C the change of surface oxygen content is larger than the change of bulk oxygen which indicates the presence of adsorbed oxygen. An adsorption isotherm obtained at 720°C shows that the degree of coverage 0 = 0.07 is approached near the