Self-assembled monolayers (SAMs) of n-alkanethiols on mechanically polished polycrystalline nickel substrates are presented. The effects of several preparation conditions of the surface upon the metal/sulfur bonds and monolayer properties are evidenced. Of particular importance are the electrochemical reduction of the native oxide, the thiol concentration (10 -3 versus 10 -1 M), and the nature of the solvent (ethanol, acetonitrile, n-heptane, toluene, and carbon tetrachloride).

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In this paper, two monolayers self-assembled on a silver substrate are compared: a monolayer of n-hexadecanethiol and a monolayer of n-11-perfluorobutylundecanethiol. The protecting properties of both monolayers have been extensively studied by X-ray photoelectron spectroscopy, contact angle, polarization modulation infrared reflection absorption spectroscopy, conventional electrochemical techniques (polarization curves and electrochemical impedance spectroscopy), and scanning vibrating electrode technique. Both monolayers were successfully self-assembled but organization is slightly different, the fluorinated segment introduces small disorganization. Nevertheless, good homogeneous corrosion protection is observed for each monolayer.

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