Development of a Model for Charge Transport in Conjugated Polymers

Wang, Xuezheng; Shapiro, Benjamin; Smela, Elisabeth

doi:10.1021/jp802941m

Cited by 54 publications

(72 citation statements)

References 36 publications

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“…The moving front experiment has shown that drift of ions is important for understanding electrochemical doping/dedoping in conjugated polymer films, [25][26][27][28] a fact that is often neglected in the interpretation of electrochemical impedance data. The latter describe ion transport in the film primarily as a result of diffusion, driven by the accumulation of ions at the electrolyte/polymer interface.…”

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confidence: 99%

A physical interpretation of impedance at conducting polymer/electrolyte junctions

et al. 2014

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We monitor the process of dedoping in a planar junction between an electrolyte and a conducting polymer using electrochemical impedance spectroscopy performed during moving front measurements. The impedance spectra are consistent with an equivalent circuit of a time varying resistor in parallel with a capacitor. We show that the resistor corresponds to ion transport in the dedoped region of the film, and can be quantitatively described using ion density and drift mobility obtained from the moving front measurements. The capacitor, on the other hand, does not depend on time and is associated with charge separation at the moving front. This work offers a physical description of the impedance of conducting polymer/electrolyte interfaces based on materials parameters.

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confidence: 99%

A physical interpretation of impedance at conducting polymer/electrolyte junctions

et al. 2014

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“…The smaller the permittivity, the smaller these regions and, consequently, the finer the mesh needs to be, resulting in unreasonably high simulation times. In keeping with the approach utilised in [26], the relative permittivities of the electrolyte and the polymer have been increased to mitigate this effect.…”

Section: Numerical Results: Electric Cellmentioning

confidence: 99%

“…Modelling of bulk composite actuators has received considerable attention in the past, especially for ionomeric polymer/metal composites, so-called IPMCs [23][24][25]. The complex charge transport behaviour in conjugated polymers is modelled in [26] without consideration of electromechanical effects. Models for actuation strains and volume changes in conjugated polymers are proposed in [27,28].…”

Section: Figmentioning

confidence: 99%

Functionalisation of metal–polymer-nanocomposites: Chemoelectromechanical coupling and charge carrier transport

Wilmers

Bargmann

2018

Extreme Mechanics Letters

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a b s t r a c tElectrochemical actuation in nanoporous metals is achieved by impregnation of the material's pore space with a ionic conductor, typically an aqueous electrolyte. These hybrid actuators exhibit fully reversible deformation and mechanical properties that can be controlled by electric signals. Recently, set-ups have been proposed in which the nanoporous metal's surface is additionally coated with a conjugated polymer, resulting in a nanocomposite that exhibits strongly increased actuation strains compared to the pure metal while still retaining the mechanical strength of the metal backbone.In order to exploit the full potential of these nanocomposite actuators, a detailed understanding of the underlying ion transport mechanisms and means to predict the actuator's response are necessary. We present an interface-extended continuum mechanical model to study actuation in pure nanoporous gold and nanoporous gold-polypyrrole nanocomposites. Simulations predict significantly enhanced actuation strains due to the presence of the polymer phase and show that both, the nanocomposite's structure and the ions' mobilities, greatly affect the actuator's response.

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“…Despite the difference in architecture of those devices, the underlying physics is identical and common with cyclic voltammetry analysis. In particular, models utilized for explaining experimental results do not typically assume any redox reactions and are solely based on the coupling between electronic and ionic motion as described by the Nernst-Planck-Poisson equations (drift-diffusion equations) [68,69,70].…”

Section: Charge Transport Models For Conductive Polymersmentioning

confidence: 99%

Ionic and electronic transport in electrochemical and polymer based systems

Volkov

2017

Linköping Studies in Science and Technology. Dissertations

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Description of the cover image:An ion exchange membrane Ionic and electronic transport in electrochemical and polymer based systemsCopyright © 2017 Anton Volkov (unless otherwise noted) Division of Physics and Electronics Department of Science and TechnologyLinköping University SE-601 74 Norrköping, Sweden Norrköping, March 2017 ISBN: 978-91-7685-548-5 ISSN 0345-7524 Printed in Sweden by LiU-Tryck, Linköping, 2017 Electronic publication: www.ep.liu.seTo my parents, Alla and Vyacheslav. AbstractElectrochemical systems, which rely on coupled phenomena of the chemical change and electricity, have been utilized for development an interface between biological systems and conventional electronics. The development and detailed understanding of the operation mechanism of such interfaces have a great importance to many fields within life science and conventional electronics. Conducting polymer materials are extensively used as a building block in various applications due to their ability to transduce chemical signal to electrical one and vice versa. The mechanism of the coupling between the mass and charge transfer in electrochemical systems, and particularly in conductive polymer based system, is highly complex and depends on various physical and chemical properties of the materials composing the system of interest.The aims of this thesis have been to study electrochemical systems including conductive polymer based systems and provide knowledge for future development of the devices, which can operate with both chemical and electrical signals. Within the thesis, we studied the operation mechanism of ion bipolar junction transistor (IBJT), which have been previously utilized to modulate delivery of charged molecules. We analysed the different operation modes of IBJT and transition between them on the basis of detailed concentration and potential profiles provided by the model.We also performed investigation of capacitive charging in conductive PEDOT:PSS polymer electrode. We demonstrated that capacitive charging of PEDOT:PSS electrode at the cyclic voltammetry, can be understood within a modified Nernst-Planck-Poisson formalism for two phase system in terms of the coupled ion-electron diffusion and migration without invoking the assumption of any redox reactions.Further, we studied electronic structure and optical properties of a self-doped p-type conducting polymer, which can polymerize itself along the stem of the plants. We performed ab initio calculations for this system in undoped, polaron and bipolaron electronic states.Comparison with experimental data confirmed the formation of undoped or bipolaron states in polymer film depending on applied biases.Finally, we performed simulation of the reduction-oxidation reaction at microband array electrodes. We showed that faradaic current density at microband array electrodes increases due to non-linear mass transport on the microscale compared to the corresponding macroscale systems. The studied microband array electrode was used for developing a laccase-based micro...

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Development of a Model for Charge Transport in Conjugated Polymers

Cited by 54 publications

References 36 publications

A physical interpretation of impedance at conducting polymer/electrolyte junctions

A physical interpretation of impedance at conducting polymer/electrolyte junctions

Functionalisation of metal–polymer-nanocomposites: Chemoelectromechanical coupling and charge carrier transport

Ionic and electronic transport in electrochemical and polymer based systems

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