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NOx sensing properties of SnO2-xCr2O3 as a varistor-type gas sensor have been investigated in the temperature range of 200–600°C. The breakdown voltage of SnO2 shifted to a higher electric field upon exposure to NO2 at 300–500°C, and the largest breakdown voltage shift, i.e. the highest NO2 sensitivity was observed at 400°C. In contrast, the direction of the breakdown voltage shift in NO varied...
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