Electrochemical studies of some conducting polythiophene films

Waltman, R. J.; Bargon, Joachim; Diaz, A. F.

doi:10.1021/j100231a035

Cited by 505 publications

(198 citation statements)

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“…From the amount of polymer deposited, the charge fraction (δ) for monomer unit is 0.21. This result agrees with the literature [28,31,32] where δ ranges between 0.12 and 0.33, depending on the anion and reaction conditions. Fig.…”

Section: Electropolymerization Of 3-methylthiophenesupporting

confidence: 93%

“…7B) display a sponge-like structure made of thick aggregates of small particles extended over a rather large thickness. This agrees with the morphology shown by Waltman et al [32] for top SEM view of PMeT coatings.…”

Section: Sem Investigations On the Morphology Of The Filmsupporting

confidence: 92%

“…Such a potential is about 50 mV less positive than the potential of the oxidation peak of monomeric MeT [32]. The risk of overoxidation of PMeT at this potential should be negligible in our experimental conditions, since we operate in accurately dried acetonitrile; in fact, the addition of water or other nucleophiles is required to cause overoxidation at such a potential value [42].…”

Section: Mixed Aq55/pmet Filmsmentioning

confidence: 98%

“…The electrochemical polymerization of MeT has been studied in detail [28][29][30][31][32], however, some points of interest for the preparation of the mixed film are revisited here. Fig.…”

Section: Electropolymerization Of 3-methylthiophenementioning

confidence: 99%

“…In order to develop a layer suitable as electrode coating for electrochemically controlled ion-exchange in non-aqueous solvent, in the present work we report on the preparation and characterization of an electrode coating obtained by electropolymerisation of 3-methylthiophene (MeT) on AQ55, with the aim of combining the good cation exchange properties of the latter with the redox switchability of the former [9,[28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Composite films of poly-(ester-sulphonated) and poly-(3-methylthiophene) for ion-exchange voltammetry in acetonitrile solutions

Scopece

Moretto

Polizzi

et al. 2006

Electrochimica Acta

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This paper describes the preparation and characterisation of a polymeric electrode coating based on a composite of the poly-(estersulphonated) Eastman AQ55 ® (AQ55) and poly-(3-methylthiophene) (PMeT), which is used for the controlled uptake and partial release of electroactive cations in acetonitrile solutions. The film is prepared by electrochemical oxidation in acetonitrile of 3-methylthiophene on glassy carbon disks or Pt-quartz crystal electrodes pre-coated with a thin film of AQ55.The electropolymerisation process is controlled so that the overall number of positive charges of oxidised PMeT is equal to the number of negative charges of the sulphonate groups of AQ55. Cyclic voltammetry and quartz crystal microbalance measurements indicate that the AQ55/PMeT mixed film is stable in acetonitrile and that its cation-exchange properties depend on the applied potential. When the PMeT moieties are reduced, the film incorporate cations; following electrochemical oxidation of the coating causes a release of the incorporated cations which, however, is only partial.Scanning electron microscopy (SEM) examination of cross sections of the composite polymer layer indicate that it is really a bi-layer, made by an inner compact layer of AQ55 on which a thicker and porous PMeT layer is grown. The outer PMeT layer acts as a barrier whose ionic charges can be changed electrochemically from positive (oxidation) to neutral (reduction). These ionic charges hinder or allow, respectively, the permeation of redox cations which tend to interact with the negatively charged sulphonic sites of the AQ55 layer. Direct self-neutralization of part of the positive charges of oxidized PMeT by the AQ55 sulphonic groups allows the release of part of the redox cations incorporated previously in the mixed film when PMeT is in the reduced state. By operating in acetonitrile solutions without added electrolyte it is possible to increase the fraction of redox cations which are released in consequence of the oxidation of PMeT; this suggests a slower and only partial oxidation of PMeT under such experimental conditions.

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Section: Electropolymerization Of 3-methylthiophenesupporting

confidence: 93%

Section: Sem Investigations On the Morphology Of The Filmsupporting

confidence: 92%

Section: Mixed Aq55/pmet Filmsmentioning

confidence: 98%

“…The electrochemical polymerization of MeT has been studied in detail [28][29][30][31][32], however, some points of interest for the preparation of the mixed film are revisited here. Fig.…”

Section: Electropolymerization Of 3-methylthiophenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Composite films of poly-(ester-sulphonated) and poly-(3-methylthiophene) for ion-exchange voltammetry in acetonitrile solutions

Scopece

Moretto

Polizzi

et al. 2006

Electrochimica Acta

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Electrochemical synthesis and properties of poly(3-methylthiophene): Novel synthesis of poly(3-methylthiophene) with pentachlorostannate and hexachloroantimonate

Singh

Dubey

Prasad³

et al. 1999

J. Appl. Polym. Sci.

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Poly(3-methylthiophene) (P3-MeT) doped with different anions were prepared electrochemically in the presence of tetraalkylammonium salts. The new poly(3-methylthiophene) SnCl 5 Ϫ and SbCl 6 Ϫ (P3-MeT SnCl 5 and P3-MeT SbCl 6 ) were prepared electrochemically using tetra-n-butylammonium pentachlorostannate and tetra-n-butylammonium hexachloroantimonate as the supporting electrolytes. The effect of current density, salt concentration, reaction temperature, and the nature of solvents on the polymer yield and polymer conductivities have been investigated. Cyclic voltammetry of poly(3-methylthiophene) has been examined at platinum electrode in 1,2-dichloroethane medium containing n-Bu 4 NSnCl 5 , Bu 4 NSbCl 6 , and Bu 4 NClO 4 as the supporting electrolytes in the range of Ϫ1.0 to 1.7 V versus SCE in the presence and absence of 3-methylthiophene. Electrical conductivity, magnetic susceptibility measurements, and structural determination by elemental analysis and infrared studies were also made. Scanning electron microscopy revealed a globular, branched, fibrous and a spongy, fibrous morphology of poly(3-methylthiophene) SnCl 5 Ϫ , ClO 4 Ϫ , and SbCl 6 Ϫ , respectively. The thermal analysis of the polymers was also investigated. Possible causes for the observed lower conductivity of these polymers have also been discussed.

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Poly(3-methylthiophene)-Coated Carbon Fiber Microelectrode for the Voltammetric Measurement of Herbicide Metamitron

et al. 1999

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A carbon ®ber microelectrode was modi®ed by electrodeposition of a polymeric coating of poly(3-methylthiophene) (P3MT) by cycling the potential between 0.0 and 1.7 V (vs. AgaAgCl). The electrochemical reduction of the herbicide metamitron in this kind of microelectrode was studied by applying several voltammetric techniques like cyclic voltammetry and square wave voltammetry. The cathodic stripping voltammetric response for metamitron was found to be dependent on the ®lm thickness, the accumulation time and on the pH of measurement medium. A good linear relationship between the cathodic stripping peak current and metamitron concentration was obtained over the range 1.0610, using a carbon ®ber microelectrode modi®ed with 15 coatings and 6 min preconcentration time at open circuit. The reproducibility of the measurements was satisfactory, RSD of 0.96 % (n 10) and the detectability achieved was of 2.83610 710 mol L 71.

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Electrochemical studies of some conducting polythiophene films

Cited by 505 publications

References 1 publication

Composite films of poly-(ester-sulphonated) and poly-(3-methylthiophene) for ion-exchange voltammetry in acetonitrile solutions

Composite films of poly-(ester-sulphonated) and poly-(3-methylthiophene) for ion-exchange voltammetry in acetonitrile solutions

Electrochemical synthesis and properties of poly(3-methylthiophene): Novel synthesis of poly(3-methylthiophene) with pentachlorostannate and hexachloroantimonate

Poly(3-methylthiophene)-Coated Carbon Fiber Microelectrode for the Voltammetric Measurement of Herbicide Metamitron

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