Oxygen gas-sensing properties in dc conductivity of a semiconductive glass in the system V2O5-SrO-Sb2O3 with a composition V2O5:SrO:Sb2O3=73:18:9 (mol%) were investigated in flowing oxygen and argon gases at temperatures between 433 and 439K. The conductivity was lower in O2 and higher in Ar than that in air. This was attributable to changes in the concentration of V4+ ion as a function of oxygen partial pressure. Changes in conductivity by switching the flowing atmosphere between O2 and Ar gases were found to be reproducible. Sensitivity of 4.5 (433K) was obtained to 100% oxygen. The dynamic changes in conductivity by switching the flowing atmospheres were well explained by an oxygen diffusion and desorption model.
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Sakata et al. (1994) studied this question.
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