Anion-excluding polypyrrole films

Freund, Michael S.; Bodalbhai, L.; Brajter-Toth, Anna

doi:10.1016/0039-9140(91)80014-q

Cited by 59 publications

(32 citation statements)

References 17 publications

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“…It is evident an increase of R ct that means an increased ability to avoid the redox process of anions confirming what has been proved from other authors [21,22,23]. In fact, during the formation of carbonyl groups and interruption of the conjugation, anions are electrostatically rejected and, as a result, the discharge reaction of ferricyanide is progressively inhibited [24].…”

Section: Resultssupporting

confidence: 83%

An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film

et al. 2011

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Polypyrrole (pPy) thin films were synthesized electrochemically by a pulse method on platinum electrodes in Nbutyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide ionic liquid (PYR 14 TFSI). An important aspect of this procedure is the use of an ionic liquid, as synthetic medium. Further, it can be used for several procedures and it can then be renewed and recycled by a simple extraction just with warm water. It is therefore possible to remove it from all the residual oxidized pyrrolic compounds and purify the solvent in a very simplicistic way. After the synthesis pPy was overoxidized (opPy ) and the process was followed by EIS (Electrochemical Impedance Spectroscopy). opPy is attractive for the realization of sensors and biosensors because of its good selectivity towards hydrogen peroxide (H 2 O 2 ) with respect to the most common interferents. In particular it can find an application in food process control. The EIS response to hydrogen peroxide and biological interferents indicated opPy as a highly sensitive electrochemical platform for impedimetric sensing. The glucose oxidase enzyme (GOD) was immobilized onto the polymer and the modified electrode was assembled and tested as an impedimetric biosensor. This technique seems very promising for application in food process control.

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Section: Resultssupporting

confidence: 83%

An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film

et al. 2011

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“…A possible explanation is differences in polymer morphological structure and pore size caused by changing the substrate from glassy carbon to gold and the different counterion used during polymerization. The counterion is reported to effect the secondary structure of the polymer [17]. The pore size of the poly(pyrro1e) membrane resulting from the expulsion of the TEAP anion in the present study, will be smaller than the corresponding pore from the IC anion, hence a more electron dense polymer would be expected for TEAP and electrostatic interactions between the electron density within the membrane and the cationic species will hinder the diffusion of the species through the membrane.…”

Section: Resultsmentioning

confidence: 86%

Prediction and characterization of the charge/size exclusion properties of over‐oxidized poly(pyrrole) films

Farrington

Slater

1997

Electroanalysis

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Over-oxidation of poly(pyrro1e) films has been shown to result in permselective films favoring cation transport and excluding anions. The exclusion principal depends on both the size of the analyte and electrostatic interactions between the analyte and the polymer film. The size of the polymer dopant anion and hence the resulting pore size of the polymer has been varied and the size exclusion studied. Molecules just larger than the size of the original dopant anion can pass through the membrane, thought to be due to solvation of the incorporated anion in the initial polymer preparation. The pH of the sample analyte has been varied to test the permselective properties of the prepared polymer. A range of substituted pyrroles were polymerized, over-oxidized and compared for selectivity. The nature and position of substituents on the pyrrole monomer were observed to change the morphological structure of the polymer and hence the resulting selectivity of the membrane. Molecular modeling of both the analytes and the dopant ions has allowed sizekharge density profiles of the analytes to be compared with the predicted size of the polymer pores.

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“…[1,2] Indeed, OPPy films are often used as an interferent rejection coating, as a permselective layer against anion. [3,4] It has been shown that OPPy films are as effective as Nafion in anion rejection. [5,6] Recently, amperometric biosensors based on the detection of enzymatically generated H 2 O 2 have been developed for a wide range of analytes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a very thin overoxidized polypyrrole membrane: application to H₂O₂ determination

Debiemme‐Chouvy

Gallois

2010

Surface & Interface Analysis

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In the design of amperometric biosensor based on the electrochemical detection of enzymatically generated H 2 O 2 , an inert membrane is often present on the electrode in order to separate it from the solution to prevent interferences. The inert membrane could be an overoxidized polypyrrole film. Generally, the overoxidized polypyrrole films are obtained in two steps, the first one being the electrosynthesis of the polypyrrole film and the second one its overoxidation in an indifferent electrolyte. In this article, a new electrochemical one-step process allowing the formation of a very thin overoxidized polypyrrole film is used. This film is characterized by SEM, XPS and cyclic voltammetry in the presence of monoelectronic reversible redox couples. Actually, the film is an electrical insulating compact layer about 10-nm thick and pin hole free. This overoxidized polypyrrole membrane was tested on one hand for the rejection of anions and large molecules such as Fe(CN) 6 3/4− and Ru(NH 3 ) 6 2/3+ , respectively, and on the other hand, for the determination of hydrogen peroxide. The results show a very good efficiency of the membrane for the rejection of the redox species tested. Finally, it is shown that the membrane/Pt electrode allows quantitative electrooxidation of H 2 O 2 . Indeed, using this electrode, under potentiostatic condition, a linear response of the anodic current in function of the H 2 O 2 electrolyte concentration was found.

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Anion-excluding polypyrrole films

Cited by 59 publications

References 17 publications

An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film

An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film

Prediction and characterization of the charge/size exclusion properties of over‐oxidized poly(pyrrole) films

Characterization of a very thin overoxidized polypyrrole membrane: application to H₂O₂ determination

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Anion-excluding polypyrrole films

Cited by 59 publications

References 17 publications

An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film

An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film

Prediction and characterization of the charge/size exclusion properties of over‐oxidized poly(pyrrole) films

Characterization of a very thin overoxidized polypyrrole membrane: application to H2O2 determination

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Characterization of a very thin overoxidized polypyrrole membrane: application to H₂O₂ determination