Ion-Conducting Polymers and Their Use in Electrochemical Sensors

Studies have shown that ionic polymers in contact with a conductive medium such as a metal allow electrochemical reactions at this interface. Table 3.7 lists possible electrochemical reactions for gas 

As seen in Table 3.6, at present Nafion is the most used polymer for the design of electrochanical gas sensors. Experiment has shown that Nafion has good proton conductivity, high gas permeability, outstanding chanical stability, and good mechanical strength, i.e., possesses parameters important for gas sensor fabrication, especially Hj sensors. However, it is necessary to take into account that, in general. 

Analyte Type Arrangement Detection limit (ppm) Upper limit of dynamic range (ppm) 

SPE solid polymer electrolyte, GDE gas diffusion electrode Galvanic mode 

Source Reprinted with permission from Knake et al. (2005). Copyright 2005 Elsevier 

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