Instability of metal oxide-based conductometric gas sensors and approaches to stability improvement (short survey)

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2D Materials for Gas Sensing Applications: A Review on Graphene Oxide, MoS2, WS2 and Phosphorene (2018, background): “This issue is not always dealt with in the scientific papers; however, it is very important for the engineering of the devices [41].”
NOx sensors based on semiconducting metal oxide nanostructures: Progress and perspectives (2012, background): “owever, these reviews either present a broader viewpoint of etal oxide gas sensors [1–5], or specifically discuss some distinct orphology of metal oxides and the gas sensors derived from them 6–9].”
Amorphous Pd-assisted H2 detection of ZnO nanorod gas sensor with enhanced sensitivity and stability (2018, background): “Unfortunately, it is reported that the sensing performance deteriorated with metal oxide surface contamination by strong adsorbates such as sulfur [42,43].”
Signal and Data Processing for Machine Olfaction and Chemical Sensing: A Review (2012, background): “sive chemicals or silicone vapors, (iii) absorption and desorption on tubing and sensor chambers may lead to memory effects, etc [108].”