Stability is a characteristic that takes into account the reproducibility of device measurements after long use. To avoid the effects of non-repeatability after repeated use, several gas sensor manufactureres submit the organic material (in active phase) and nobles to a thermal pre-treatment, which decrease subsequent material instabilities.
During treatments, samples are submitted to high calcination temperatures (from 400 °C to 1000 °C for 1 to 24 hours) to prevent instabilities in their working life (lifespan) in where they are heated 200-400 °C continuously.
Gas sensor should be stable in a variable ambient atmosphere, but it should also be reversibly unstable in the presece of the gases to be detected.
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