Sensing mechanisms amperometric sensor

Figure 8. Sensing mechanism of the amperometric sensor. "Reproduced with permission from Ref. 13. Copyright 1984, The Chemical Society of Japan. "...

Figure 11. Sensing mechanism of the modified amperometric sensor.

A solid electrolyte is a functional material in which single ions migrate through a solid structure, and these materials are expected to be applied as components of compact gas sensors. There are two sensing mechanisms which may be exploited in solid electrolyte sensors potentiometric and amperometric. Potentiometric sensors may be further divided into equilibrium and non-equilibrium potential (mixed potential) types, although typically only the equilibrium potential type has been investigated for use in CO2 sensors. 

The role of the sensing agent in a chemical sensor is to provide a transduction mechanism which enables an analytical signal to be obtained. The vast majority of calixarenes investigated as chemical sensors have employed an electrochemical transduction mechanism, either potentiometric or voltammetric/amperometric, although more recently there has been a move towards optical transduction. As the vast majority of working devices described have been potentiometric, this paper will focus mainly on these devices. 

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