Modified electrodes interplay

However, the interplay between electrolyte and polymer layer needs to be considered when optimizing the performances of polymer-modified electrodes. Structural factors will influence the interfacial ion transport and this will have a direct effect on the mechanism and location within the polymer layer of the mediation process. The following discussion will show that the nature of the mediation process can be changed dramatically by changing the electrolyte, from a situation where an electrochemical sensor with good sensitivity is obtained, to a situation where the sensitivity obtained is not much better than that observed for the bare electrode. 

This type of approach is essential in establishing a sound understanding of the interplay of diffusion and reaction in this type of modified electrode and more generally in amperometric biosensors. 

Finally when k is sufficiently large or indeed kDs is sufficiently small, then the reaction between B and S is confined to a region of molecular dimensions at the outer film/solution interface, and S is not partitioned into the film. Hence we see that the concept of reaction layer thickness is very useful It conveys a concise picture of the interplay between transport and kinetics in the modified electrode. 

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