Criteria for Metal Oxide Application in Solid Electrolyte-Based Gas Sensors

1 Criteria for Metal Oxide Application in Solid Electrolyte-Based Gas Sensors 

Numerous experimental studies have shown that for electrochemical sensors to be acceptable for gas sensor market, solid electrolytes should satisfy the following requirements (Thangadurai and Weppner 2006 Amar et al. 2011). 

UPON lithium phosphorus oxynitride, NASICON sodium super-ionic conductor Source Data from Park et al. (2003), Iwahara (2009), etc. 

To be used successfully in a chemical sensor, conduction in the ionic conductor should preferably  

We need to say that the requirement of a pure ion for conducting is the most difficult for fulfillment, because, in this case, the level of any electronic contribution to the total electrical conductivity must be negligible. However, this is not at all easy to achieve. Even very low concentrations of electronic carriers will give rise to a significant electronic component because of the very high mobility of electrons and holes in comparison with the ionic mobilities. Therefore, most ion conductors are, in fact, mixed conductors, and only very few are capable of being classed as pme ionic conductors. 

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