An acoustic impedance study of PEDOT layers obtained in aqueous solution

Lyutov, V.; Gruia, Violeta-Tincuţa; Efimov, Igor; Bund, Andreas; Tsakova, V.

doi:10.1016/j.electacta.2015.12.177

Cited by 25 publications

(17 citation statements)

References 43 publications

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“…The plasticity of the polymer is expected to depend on the number of solvent molecules that are expulsed when anions are incorporated. It was reported in [56] that PEDOT/SDS is more stiff compared with other films, due to the fact that weak transport of solvent molecules is implied in this case, as proven by the EQCM data. The dodecylsulfate is much heavier than the perchlorate ions (molar mass 265.38 g/mol for dodecylsulfate and only 99.45 g/mol for perchlorate, ClO 4 − ).…”

Section: Influence Of Sds On Electropolymerization Of Pedotsupporting

confidence: 60%

“…It was shown in previous studies that PEDOT/SDS has a significant stiffness compared with PEDOT films synthesized in the presence of ClO 4 − , PSS, or PAMS [48,56,57]. The plasticity of the polymer is expected to depend on the number of solvent molecules that are expulsed when anions are incorporated.…”

Section: Influence Of Sds On Electropolymerization Of Pedotmentioning

confidence: 98%

“…The dodecylsulfate is much heavier than the perchlorate ions (molar mass 265.38 g/mol for dodecylsulfate and only 99.45 g/mol for perchlorate, ClO 4 − ). According to Lyutov et al [56], being bigger, they could be washed out during PEDOT polymerization by CV, and thus their incorporation in the film could be much smaller compared with the other doping ions.…”

Section: Influence Of Sds On Electropolymerization Of Pedotmentioning

confidence: 99%

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Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films

Gruia

Ispas

Efimov

et al. 2020

J Solid State Electrochem

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Poly (3,4-ethylenedioxythiophene), PEDOT, films were synthesized at room temperature by potentiodynamic and potentiostatic step deposition in aqueous solutions containing EDOT monomer and LiClO4. In some solutions, the effect of small amounts of sodium dodecylsulfate, SDS, on the polymerization rate of EDOT and on the stiffness of the obtained PEDOT film was studied. The obtained PEDOT films were transferred in aqueous solutions containing cations with different molar mass, such as H+, Li+, Na+, K+, and Cs+. The apparent molar masses of the exchanged species during potentiodynamic experiments were determined by in situ microgravimetry. These measurements underlined the importance of the electrolyte chosen for electropolymerization process. It is known that SDS anions can be trapped inside the polymer layer during electropolymerization, providing them with a cation exchange behavior. However, even if the PEDOT films were deposited from an electrolyte without SDS, they still acted as cation exchangers.

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Section: Influence Of Sds On Electropolymerization Of Pedotsupporting

confidence: 60%

Section: Influence Of Sds On Electropolymerization Of Pedotmentioning

confidence: 98%

Section: Influence Of Sds On Electropolymerization Of Pedotmentioning

confidence: 99%

See 1 more Smart Citation

Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films

Gruia

Ispas

Efimov

et al. 2020

J Solid State Electrochem

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“…Hillman and co-workers have reported an increase in the stiffness of PANI films due to insertion of anions and the expulsion of the solvent molecules [12,34]. Bund et al observed that the influx of anions may increase the stiffness of PEDOT film and the variations of G´ and G" were correlated with concentrations of charged species within film [35,36]. It is considered that such viscoelastic changes are somewhat associated with the electrochemical performance of the film, as the flux of ions and solvent during the charge-discharge process can modify the intermolecular interactions between polymer chains, which in turn substantially affect the film viscoelasticity.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Gao

Sel

Perrot

2017

Electrochimica Acta

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To cite this version:Wanli Gao, Ozlem Sel, Hubert Perrot. Electrochemical and viscoelastic evolution of dodecyl sulfatedoped polypyrrole films during electrochemical cycling. Electrochimica Acta, Elsevier, 2017, 233, pp.262 -273. 10 ABSTRACT:The correlation between electrochemical and viscoelastic properties of electrodeposited dodecylsulfate-doped polypyrrole (PPy-DS) during electrochemical cycling process was described through combining electrochemical quartz-crystal microbalance (EQCM), ac-electrogravimetric characterizations and electroacoustic measurements. As the PPy-DS electrode evolves during the course of consecutive cycling in aqueous NaCl electrolyte, the film exhibits (i) an obvious ion-selective transition from cations to anions in the charge compensation process; (ii) an inferior electrochemical performance accompanied with increased stiffness (increased storage moduli, G´); and (iii) depleted capability of ionic exchange through film/electrolyte interface. PPy-DS conducting polymer electrodes (CPEs) are of interest in energy storage and the relationship between electrochemical and viscoelastic properties during electrochemical cycling process is essential for promoting the performance of these devices. In this perspective, ac-electrogravimetry combined with electroacoustic measurements can be suggested as an alternative method to synchronously probe the electrochemical and mechanical evolution and has the potential to offer a generalized route to study aging mechanism of CPEs.

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“…The change of the material state in the redox reactions often induces a mechanical breathing strain and a dynamic change of the mechanical properties of the polymers, although there is little consensus in existing studies on how the mechanical behavior quantitatively evolves over electrochromic processes. Previous measurements of the mechanical properties of poly(3,4-ethylenedioxythiophene) (PEDOT) using acoustic impedance showed that the shear modulus was sensitive to the doping level [28][29][30] , temperature 28,29 , electrolyte 28,29 , crosslinker 31,32 , and even film thickness 33 . Ispas et al 28 .…”

mentioning

confidence: 99%

Mechanical breathing in organic electrochromics

et al. 2020

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The repetitive size change of the electrode over cycles, termed as mechanical breathing, is a crucial issue limiting the quality and lifetime of organic electrochromic devices. The mechanical deformation originates from the electron transport and ion intercalation in the redox active material. The dynamics of the state of charge induces drastic changes of the microstructure and properties of the host, and ultimately leads to structural disintegration at the interfaces. We quantify the breathing strain and the evolution of the mechanical properties of poly(3,4-propylenedioxythiophene) thin films in-situ using customized environmental nanoindentation. Upon oxidation, the film expands nearly 30% in volume, and the elastic modulus and hardness decrease by a factor of two. We perform theoretical modeling to understand thin film delamination from an indium tin oxide (ITO) current collector under cyclic load. We show that toughening the interface with roughened or silica-nanoparticle coated ITO surface significantly improves the cyclic performance.

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An acoustic impedance study of PEDOT layers obtained in aqueous solution

Cited by 25 publications

References 43 publications

Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films

Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Mechanical breathing in organic electrochromics

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