Potentiostatic Pulse Measurements at Conducting Polymers

Genz, O.; Lohrengel, M. M.

doi:10.4028/www.scientific.net/msf.191.207

Cited by 4 publications

(7 citation statements)

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“…1b,c. The advantageous use of sulphate ions in the context of doping conductive polymers has been previously demonstrated by Genz and Lohrengel (41,42) and was also shown by Massonnet et al for PEDOT (17).…”

Section: Introductionmentioning

confidence: 60%

“…Further, it was shown to be a potent doping agent for conductive polymers (41,42), and a synthesis method for highly conductive PEDOT with said counter-ion was already developed previously (23,43).…”

Section: Introductionmentioning

confidence: 99%

“…Our choice fell on sulphate as the counter-ion, as it is supplies oxygen to interact with the polymer backbone, thus possibly mimicking the structural properties found in PEDOT. Further, it was shown to be a potent doping agent for conductive polymers [ 41 , 42 ], and a synthesis method for highly conductive PEDOT with said counter-ion was already developed previously [ 23 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

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Overcoming intra-molecular repulsions in PEDTT by sulphate counter-ion

Farka

Greunz

Yumusak

et al. 2021

Science and Technology of Advanced Materials

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We set out to demonstrate the development of a highly conductive polymer based on poly-(3,4-ethylenedithia thiophene) (PEDTT), PEDOTs structural analogue historically notorious for structural disorder and limited conductivities. The caveat therein was previously described to lie in intra-molecular repulsions. We demonstrate how a tremendous > 2600-fold improvement in conductivity and metallic features, such as magnetoconductivity can be achieved. This is achieved through a careful choice of the counter-ion (sulphate) and the use 2 of oxidative chemical vapour deposition (oCVD). It is shown that high structural order on the molecular level was established and the formation of crystallites tens of nanometres in size was achieved. We infer that the sulphate ions therein intercalate between the polymer chains, thus forming densely packed crystals of planar molecules with extended π-systems.Consequently, room-temperature conductivities of above 1000 S cm -1 are achieved, challenging those of conventional PEDOT:PSS. The material is in the critical regime of the metal-insulator transition.

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Overcoming intra-molecular repulsions in PEDTT by sulphate counter-ion

Farka

Greunz

Yumusak

et al. 2021

Science and Technology of Advanced Materials

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show abstract

“…Because the Ðlm was formed in sulphuric acid, tosylate species stay in the Ðlm to fulÐll the partition equilibrium of ptoluenesulphonic acid species between Ðlm and electrolyte solution and, to satisfy the electrical neutrality on reduction of the Ðlm, hydrogen ions are exchanged. 40,45 The anodic peak in p-toluenesulphonic acid becomes not only higher, but also sharper, as the number of cycles increase ; it is even sharper in the steady CVs than in sulphuric acid. This indicates that the di †usion of the bulky tosylate anions is not involved in oxidation after the attainment of the steady state, but rather a lighter species is involved, i.e.…”

Section: In-situ Thickness Determinationmentioning

confidence: 98%

“…8 and 9. discharging with a distribution of the time constants, or structure change. 6,40,57 The slope of [ 0É5 is, however, typical for redox processes under di †usion control. Thus, di †usion plays a more important role in sulphuric acid because of the exchange of sulphate between the polymer Ðlm and solution than it does in ptoluenesulphonic acid, where the exchange of the fast protons is overridden by the relaxation process as the kinetic control.…”

Section: Transient Behaviourmentioning

confidence: 99%

A spectroelectrochemical study on polaron transformations in polyaniline in sulphuric and p-toluenesulphonic acids

El-Rahman

1997

Polym. Int.

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:The electrochemical processes involved in the oxidation of polyaniline in sulphuric and p-toluenesulphonic acids were studied under steady potential and during a potentiostatic current transient using UV-Vis absorption spectroscopy. It was found that sulphate ions are reversibly inserted into the polymer Ðlm on oxidation and removed during reduction, while tosylate ions are irreversibly accumulated slowly in the Ðlm and protons are exchange instead. The redox peaks involve two independent transformation equilibria of three main species : reduced species, polaron and bipolaron of di †erent chain lengths. While the charge involved in the polaron transformation is less than 20% of the charge involved safely in the oxidation of polyaniline before the onset of degradation, a signiÐcant capacitive contribution 40È60% was detected before the start of further oxidation of the polaron to bipolarons. Nernstian analysis of the redox process was possible only for the reverse scan and with the absorption peak of the reduced form. The spectroscopic transients showed that the oxidation, which is much slower than the reduction, is essentially the same in both acids without a signiÐcant contribution of the di †usion of dopant species in contrast with the reduction process.

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Role of electrolyte/polymer interface on the quantitative interpretation of in‐situ ellipsometry of electroactive polymer films

El-Rahman

Kudelka

Schultze

1996

Ber Bunsenges Phys Chem

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A new in-situ ellipsometric procedure has been used for determination of the optical properties and thickness of polyaniline films as a function of the redox state in sulphuric and p-toluenesulfonic acids. The results could be interpreted successfully only when the optical properties of the electrolyte/polymer was considered variable with the redox state. Most probably for the first time, the study shows, that the apparent refractive index of electrolyte varies with the redox state in a similar manner to the optical properties and thickness of the polymer film. In this case, for all calculations a one layer model was sufficient. The origin of such observation is attributed to the change in electrolyte composition at the polymer surface and heterogeneity of the film when oxidized.

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Potentiostatic Pulse Measurements at Conducting Polymers

Cited by 4 publications

References 0 publications

Overcoming intra-molecular repulsions in PEDTT by sulphate counter-ion

Overcoming intra-molecular repulsions in PEDTT by sulphate counter-ion

A spectroelectrochemical study on polaron transformations in polyaniline in sulphuric and p-toluenesulphonic acids

Role of electrolyte/polymer interface on the quantitative interpretation of in‐situ ellipsometry of electroactive polymer films

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