Ion Transport in Polymer Composites with Non-Uniform Distributions of Electronic Conductors

Dobashi, Yuta; Fannir, Adelyne; Farajollahi, Meisam; Mahmoudzadeh, Ali; Usgaocar, Ashwin; Yao, Dickson; Nguyen, Giao T.M.; Plesse, Cédric; Vidal, Frédéric; Madden, John D.

doi:10.1016/j.electacta.2017.06.141

Cited by 12 publications

(8 citation statements)

References 58 publications

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“…The resistance of the PEDOT layer of the top and bottom bilayer is derived from the difference in their impedance at low and high frequency. The ionic conductivity values for the top and bottom layers are similar to and slightly lower than the 0.04±0.002 S m −1 measured by Dobashi et al [68], in that case using aqueous LiTFSI as the electrolyte. As can be seen from table 2, there is a slight difference between the ionic conductivity of the top and the bottom PEDOT electrodes, perhaps indicating a small effect of the asymmetry on the ionic conductivity.…”

Section: Electrochemical Propertiessupporting

confidence: 81%

“…A number of properties limit current and charging speed. Polymer ionic conductivity is one of these factors [68] (refer to equations (1), ( 2), ( 4)), which in turn is a factor that can limit strain rate and bending speed of the trilayer actuator. The PEDOT ionic conductivity was determined using an electrochemical impedance spectroscopy measurement according to a procedure described previously [68,69] (refer to supplementary information figure SII1).…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

“…Polymer ionic conductivity is one of these factors [68] (refer to equations (1), ( 2), ( 4)), which in turn is a factor that can limit strain rate and bending speed of the trilayer actuator. The PEDOT ionic conductivity was determined using an electrochemical impedance spectroscopy measurement according to a procedure described previously [68,69] (refer to supplementary information figure SII1). It has been shown that there is an asymmetry between the top and the bottom PEDOT electrodes in a trilayer actuator fabricated by vapor phase polymerization [67].…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

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Nonlinear dynamic modeling of ultrathin conducting polymer actuators including inertial effects

Nguyen

Dobashi

Soyer

et al. 2018

Smart Mater. Struct.

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Trilayer conducting polymer (CP) actuators are potential alternatives to piezoelectric and electrostatic actuators due to their large strain, and recently demonstrated operation at hundreds of Hertz. However, these actuators exhibit nonlinear electrical and mechanical properties as a function of their oxidation state, when operated over their full strain range, making it more challenging to accurately predict their mechanical behavior. In this paper, an analytical multiphysics model of the CP actuators is proposed to predict their nonlinear dynamic mechanical behavior. To demonstrate the accuracy of the model, a trilayer actuator composed of a solid polymer electrolyte sandwiched between two poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes was fabricated and characterized. This system consists of an electrical subsystem represented by an RC equivalent circuit, an electro-mechanical coupling matrix, and a mechanical subsystem described by using a rigid finite element method. The electrical conductivity and the volumetric capacitance, an empirical strain-to-charge ratio, and Young's modulus of the actuator as a function of the PEDOT electrode charge state were also implemented into the model, using measured values. The proposed model was represented using a bond graph formalism. The concordance between the simulations and the measurements confirmed the accuracy of the model in predicting the nonlinear dynamic electrical and mechanical response of the actuators. In addition, the information extracted from the model also provided an insight into the critical parameters of the actuators and how they affect the actuator efficiency, as well as the energy distribution including dissipated, stored, and transferred energy. These are the key parameters for designing, optimizing, and controlling the actuation behavior of a trilayer actuator.

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Section: Electrochemical Propertiessupporting

confidence: 81%

Section: Electrochemical Propertiesmentioning

confidence: 99%

Section: Electrochemical Propertiesmentioning

confidence: 99%

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Nonlinear dynamic modeling of ultrathin conducting polymer actuators including inertial effects

Nguyen

Dobashi

Soyer

et al. 2018

Smart Mater. Struct.

Self Cite

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“…Achieving a complete coincidence between experimental results and fit of the equivalent circuit is a serious challenge for PEDOT:PSS/Graphene since this material encompasses phases with different conductivity mechanisms, further complicating modeling due to different capacitive effects manifesting in various frequency ranges [ 40 ]. Indeed, better fitting of experimental results of tests over two days in artificial sweat is achieved using more complex equivalent electrical circuits such as hybrid series/parallel models, involving more elements corresponding to distributed electronic phases in an ion-conductive environment [ 45 ]. Nevertheless, we judged that using the same circuit for all electrolyte aging results has more advantages in tracking degradation processes than reducing χ 2 values at the expense of employing different and more complex equivalent electrical circuits in the modeling.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Investigation of PEDOT:PSS/Graphene Aging in Artificial Sweat

Tzaneva,

Mateev,

Stefanov

et al. 2024

Polymers

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Herein, we investigate the potential application of a composite consisting of PEDOT:PSS/Graphene, deposited via spray coating on a flexible substrate, as an autonomous conducting film for applications in wearable biosensor devices. The stability of PEDOT:PSS/Graphene is assessed through electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and linear polarization (LP) during exposure to an artificial sweat electrolyte, while scanning electron microscopy (SEM) was employed to investigate the morphological changes in the layer following these. The results indicate that the layers exhibit predominant capacitive behavior in the potential range of −0.3 to 0.7 V vs. Ag/AgCl, with a cut-off frequency of approximately 1 kHz and retain 90% capacity after 500 cycles. Aging under exposure to air for 6 months leads only to a minor increase in impedance, demonstrating potential for storage under non-demanding conditions. However, prolonged exposure (>48 h) to the artificial sweat causes significant degradation, resulting in an impedance increase of over 1 order of magnitude. The observed degradation raises important considerations for the long-term viability of these layers in wearable biosensor applications, prompting the need for additional protective measures during prolonged use. These findings contribute to ongoing efforts to enhance the stability and reliability of conducting materials for biosensors in health care and biotechnology applications.

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“…Most polymers are insulators; however, there is a specific type of polymers that can conduct electricity [6]. These, called conductive polymers, can substitute the liquid electrolytes in capacitors by providing either enough ionic mobility, as it is the case for gel-like polymers, or conducting electrons, or both simultaneously [7,8]. Different conductive polymers have been used for this purpose, but poly (3,4-ethylenedioxythiophene), or PEDOT [9][10][11][12], has stood out since its discovery in 1988.…”

Section: Introductionmentioning

confidence: 99%

On the Interaction between PEDOT:PSS Dispersions and Aluminium Electrodes for Solid State Electrolytic Capacitors

Calabia Gascón,

Revilla,

Wouters

et al. 2024

Inorganics

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The use of conductive polymers in aluminium electrolytic capacitors prevents leakage and enlarges the temperature use range when compared with their liquid counterparts. PEDOT:PSS is an outstanding candidate due to its tunable properties, i.e., electronic conductivity (10−5 to 103 S/cm), and its high thermal stability. As a result of their synthesis, PEDOT:PSS dispersions are characterized by a low pH value, which can influence pH sensitive materials such as aluminium. However, no work to date has studied the interaction between PEDOT:PSS dispersions and aluminium oxide substrates. In this work, the interface and interaction between PEDOT:PSS and an aluminium electrode were studied for the first time via odd random phase electrochemical impedance spectroscopy and analysed post mortem by SEM and AFM characterization. PEDOT:PSS dispersions at different pH values (1.9, 4.9, 5.8) were applied in a layered manner onto a non-etched aluminium substrate with a grown oxide layer on top, which provided a model system for the analysis of the interface. The analysis showed that the acidic PEDOT:PSS dispersions attacked the aluminium substrate, forming pores on the surface, but had a positive impact on the capacitance of the aluminium oxide/PEDOT:PSS systems. On the other hand, neutral dispersions did not affect the aluminium electrode, but showed poor layer formation properties, and the electrochemical analysis displayed a dispersion of results ranging from capacitive to resistive behaviour.

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Ion Transport in Polymer Composites with Non-Uniform Distributions of Electronic Conductors

Cited by 12 publications

References 58 publications

Nonlinear dynamic modeling of ultrathin conducting polymer actuators including inertial effects

Nonlinear dynamic modeling of ultrathin conducting polymer actuators including inertial effects

Electrochemical Investigation of PEDOT:PSS/Graphene Aging in Artificial Sweat

On the Interaction between PEDOT:PSS Dispersions and Aluminium Electrodes for Solid State Electrolytic Capacitors

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