Abstract
Temperature-programmed desorption (TPD) has been used to investigate the effect of fluorination on the surface chemistry of several model ethers on the Al(110) metal surface. The model compounds studied were dioxolane ( ▪), diethylether [(CH 3CH 2) 2O], dimethoxymethane [(CH 3O) 2CH 2], dimethylether [(CH 3) 2O] and their fully fluorinated analogs. Perfluorination of these ethers decreases their desorption energies from ∼13 to ∼7 kcal/mol. At coverages in the range 0.1 < θ <1.0 the heat of adsorption of the fluorinated ethers is indistinguishable from that of the multilayers. The hydrogenated ethers were found to have stronger repulsive adsorbate-adsorbate interactions than the perfluorinated ethers. By comparing the surface chemistry of the ethers on Al(110) surface with that on the Cu(111) surface, it was found that the two different metals simply shift the magnitude of the adsorbate-adsorbate interactions by a constant. None of the ethers studied (either hydrogenated or fluorinated) were found to decompose on the Al(110) metal surface.
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