In connection with studies on the photographic properties of TiO2 the photocatalytic deposition of palladium and the electrochemical properties of TiO2 were investigated. In order to study both phenomena simultaneously the experiments were performed with thin, TiO2 layers deposited on a conducting substrate. It could be shown that the primary step is an anodic photocurrent (O2 evolution) which catalyzes the cathodic deposition of palladium under open‐circuit conditions. Various parameters such as space charge effects, film thickness, and doping were studied and are discussed in detail.

No abstract

No abstract

Im Zusammenhang mit den photographischen Eigenschaften von TiOg werden die photokatalytische Abscheidung von Pd und die elektrochemischen Eigenschaften von T102 untersucht.

A special electron microprobe data reduction procedure permits the determination of oxygen in vacuum‐deposited metal layers independent of the surface oxide layer, the mass thickness of which is simultaneously calculated. The method combines measurements of O Kα x‐rays at two values of the primary electron energy in the range 5–12.5 keV, which correspond to different depth distributions of x‐ray production. The measured data are evaluated by calibration curves derived from Gaussian Φ(ρz) depth distribution functions. Test analyses have been performed on amorphous metal layers with thicknesses of 0.5–1.5 μm. Typical concentrations of incorporated oxygen found ranged from 0.1 to 5 wt‐%. The influences of surface oxide films with mass thicknesses of 1–30 μg cm−2 were studied by annealing experiments in agreement with the results derived from oxygen depth profiles measured by secondary ion mass spectrometry.