In this paper we report on cathodoluminescence (CL) spectra of SnO 2 powders, synthesized using the wet chemical route. The analysis of influence of the modes of calcination ( T an -450–800 °C), and doping by both Pd and Pt (0.01–10.0 wt.%) on CL spectra was made. It was found that the measurement of CL spectra could be an effective research method of nanostructured metal oxides , aimed for gas sensor applications . It was established that in nanocrystalline SnO 2 the same system of energy levels, associated with radiative recombination , as in single crystalline and polycrystalline SnO 2 , is retained. It was found that doping by both Pd and Pt modifies the structural properties of SnO 2 grains. Also, there is an optimum doping; near 0.1–0.2 wt.%, at which a maximum intensity of cathodoluminescence is reached. It was concluded that for low concentrations of both Pd and Pt additives in SnO 2 an improvement of the material's crystal structure is promoted, and is associated with a decrease in the non-radiating recombination rate.
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Korotcenkov et al. (2006) studied this question.