Reactions Involving Electron Transfer at Semiconductor Surfaces. VI. Electron Spin Resonance Studies on Dark and Illuminated Aqueous Suspensions of Zinc Oxides.

摘要

Techniques are described permitting ESR studies on continuously circulating suspensions of powdered zinc oxides in aqueous media with pH and ionic strength carefully controlled. Only suspensions prepared from indium-doped ZnO gave any ESR signal in the dark at room temperature. Incidence of uv light onto circulating suspensions of high-purity zinc oxide yielded a new ESR singlet. Intensity vs. duration of illumination plots were obtained for these photo-generated signals by varying the residence time of particles in the uv light.