Abstract
The adsorptions of benzoic acid and of benzaldehyde on aluminium substrates are studied by XPS and SIMS. The negative and positive SIMS spectra and the XPS spectra of benzoic acid on plasma oxidised aluminium correlate with the adsorbate structure. Benzaldehyde adsorbed on plasma oxidised aluminium gives similar XPS and SIMS spectra to those of benzoic acid in agreement with the known oxidative properties of the surface. Decreasing the amount of oxygen on the substrate before adsorption of the aldehyde results in broad C1s spectra, which are difficult to interpret. The corresponding SIMS spectra show that only a fraction of the adsorbate is now in the form of the acid. SIMS fragments are observed at much higher masses than the acid ion. These are assigned to polymeric species formed by abstraction of oxygen or water from the adsorbed molecules to give hydrocarbon residues. The relative amount of acid and polymer depends on the amount of substrate oxygen.
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