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An organized hydrophobic monolayer is formed on smooth zero-valent gold by adsorption of octadecyltrichlorosilane (OTS) from a hexadecane solution. Wetting properties, infrared (IR) spectra, and ellipsometry measurements are consistent with the silyl moiety adjacent to the metal surface and with an all-trans conformation hydrocarbon chain extended vertically from the surface with a small average tilt. The silyl head groups appear to be incorporated into a two-dimensional cross-linked network of Si-O-Si bonds within the monolayer. However, polymerization is not complete as suggested by IR and Auger spectra which indicate the presence of SiOH groups and residual Cl, respectively. Electrochemical measurements indicate the monolayer-covered gold surface behaves as a blocked electrode containing pinhole defects. Conditions for film formation on Pt were also investigated for comparison.

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