Reply to Nanzer and Coeuret

Fabre, Paul-Louis

doi:10.1002/cjce.5450750423

Cited by 1 publication

(1 citation statement)

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“…Bilayer systems are promising candidates for analytical and bioanalytical applications, where the outer layer is used as a separating barrier and the inner electroactive polymer as amperometric or potentiometric sensing material. Bilayers with Na®on ®lms coated onto conducting polymers were succesfully applied, e.g., in vivo for determination of NO in the presence of interfering anions [19] or to enhance the potentiometric response from K ions [20]. On the other hand, bilayers of conducting polymers are also known as rectifying or charge trapping devices, where the redox state of one component may be kept constant, independently of the substrate electrode potential applied.…”

Section: Introductionmentioning

confidence: 99%

Studies on Charge Trapping in Polypyrrole and Poly (N-methylpyrrole) Based Bilayers of Polymers with Opposite Ion-Exchange Properties

2000

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Charge trapping effects were studied for bilayers of conducting polymers: polypyrrole with immobilized poly (4-styrenesulfonate) ionsapoly (N-methylpyrrole) doped with perchlorate ions (PPy(PSS)aPMPy) as well for PPy(PSS)aPPy (where PPy is polypyrrole doped with perchlorate ions). Trapping properties resulting from low cationic conductivity of the outer polymer layer were evaluated by comparing redox charges of oxidationareduction of bilayers and single layers, obtained by voltammetric, chronoamperometric and chronopotentiometric method. The role of oxidation state of the polymer and electrolyte concentration was taken into consideration. Trapping effect was found to be enhanced for the outer polymer coating in the reduced state and for high electrolyte concentrations. The outer ®lm was also found to prevent the inner coating from irreversible oxidation at positive potentials.

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Section: Introductionmentioning

confidence: 99%