Potentiometric properties of polypyrrole bilayers |
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Authors: | A Alumaa A Hallik V Sammelselg |
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Affiliation: | a Institute of Physical Chemistry, University of Tartu, Jakobi 2, 51014 Tartu, Estonia b Institute of Organic and Bioorganic Chemistry, University of Tartu, Jakobi 2, 51014 Tartu, Estonia |
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Abstract: | The spatially separated polypyrrole (PPy) bilayers composed of easily (PPy/Cl) and heavily permeable (PPy/dodecylsulfate) for anions component layers have been prepared by consecutive electrodeposition. The set-up of quasi-equilibrium potential Er during conditioning in the solution of electrolyte and the potentiometric response of bilayers to ions and redox system in the test solution were studied. The short-term potentiometric response of the bilayer system is mainly determined by the outer layer. The participation of the inner layer is related with permeability of the outer layer and with sensitivity of the inner layer to the ions of the test solution, and leads to the dependence of the electrode potential on the duration of the bilayer system’s exposure to the test solution. |
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Keywords: | Polypyrrole Bilayers Open-circuit relaxation Degradation Potentiometric response |
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