Potentiostat conducting polymer growth

Galvanostatic, potentiostatic as well as potentiodynamic techniques can be used to electropolymerize suitable monomeric species and form the corresponding film on the electrode. Provided that the maximum formation potentials for all three techniques are the same, the resulting porperties of the films will be broadly similar. The potentiodynamic experiment in particular provides useful information on the growth rate of conducting polymers. The increase in current with each cycle of a multisweep CV is a direct measure of the increase in the surface of the redoxactive polymer and, hence, a suitable measure of relative growth rates (Fig. 5). 

Galvanostatic, potentiostatic, or poten-tiodynamic techniques can be used to elec-tropolymerize suitable monomeric species and form the corresponding film on the electrode. The potentiodynamic experiment, in particular, provides useful information on the growth rate of conducting polymers. The increase in current with... 

The change of PT from its reduced to its conducting oxidized state was studied by Tfezuka et al. [1012] with an optical setup capable of detecting the local change in color. With a diode array detector, local changes in optical absorptivity were detected that are indicative of local conductivity. Under potentiostatic control in an acetonitrile-based electrolyte solution, processes in the film itself controlled the rate of conversion, whereas in a propylene-based solution, diffusion control was found. The results were converted into a growth model, in which oxidation starts at the polymer-solution interface and subsequently penetrates into the bulk of the polymer. 

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