Abstract
Transparent fine-granular SnO 2 and SnO 2-Pd films (SnO 2 verage particle size 25–30 nm) have been obtained by annealing of tin hydroxide sols, stabilised with oleic acid. The structure of the films was investigated by TEM, ED and Mössbauer spectroscopy. In SnO 2-Pd films, annealed at 800 °C, palladium is present as homogeneously distributed thermally stable particles ( d = 5–8 nm). Observed isomeric shifts of 119Sn Mössbauer spectra suggests the presence of partially reduced tin ions, Sn 2+ and Sn 3+, in the films. Deeper reduction of SnO 2 and formation of SnO are observed in SnO 2-Pd films, annealed at 500 °C. Thin-film sensors based on sol-gel obtained SnO 2 and SnO 2-Pd are high-sensitive to different gases (H 2, CH 4, NO, CO). They enable detection of CO and CH 4, CO and NO selectively in mixtures by controlling of sensor's operating temperature.
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