Metal oxides, interfacial electron ions effect

In this session, some representative results of interfacial electron injection studies at metal oxide surface using time-revolved IR spectroscopy will be presented. The effects of metal oxide materials, sensitizer dyes, solvents and additive ions on dye-sensitized metal oxides will be discussed. Also, a recent result regarding electron injection from a photoexcited gold nanoparticle into a Ti02 nanoparticle will be shown and its characteristics will be discussed. 

Aluminium and A1 alloys react with oxygen and water vapor in the air to produce a thin, conqtact surface oxide film which protects the underlying metal from further attack (Fig. 3.1-80). The surface layer contains mainly amorphous AI2O3 in several layers. The so-called barrier layer has an extremely low conductivity for electrons and ions and thus acts as an insulator in any interfacial electrochemical reactions. It thus affords effective protection against corrosion. If mechanical damage of the protective layer occurs, or if the layer is removed by pickling, it re-forms immediately. Aluminium and A1 alloys thus exhibit good corrosion resistance to chemicals, seawater, and the weather. 

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