Abstract
The interaction between aluminum and both stoichiometric and oxygen-deficient single-crystal TiO 2(110) surfaces has been studied using X-ray and ultra-violet photoelectron spectroscopies (XPS and UPS), Auger spectroscopy (AES), and low energy electron diffraction (LEED). Upon deposition of up to a monolayer of aluminum on the stoichiometric surface at room temperature, the aluminum becomes oxidized and the TiO 2 is reduced. At multilayer coverages, a heterogeneous region is formed consisting of a mixture of metallic and oxidized aluminum on top of a reduced TiO 2 layer. Annealing to 500°C in ultra-high vacuum completely oxidizes the remaining metallic aluminum and the titanium cations return to their fully oxidized 4 + state, due to oxygen diffusion from the bulk to the interface region. LEED shows no evidence of an ordered overlayer structure, even following annealing treatments. Oxygen-deficient TiO 2 surfaces created by 500 eV Ar + bombardment are also reactive towards aluminum; as the aluminum overlayer is oxidized, the TiO 2 becomes further reduced.
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