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11. Effect of Fluorine in Redesigning Energy-Storage Properties of High-Temperature Dielectric Polymers

Author

Deshmukh, Ajinkya A., primary, Wu, Chao, additional, Yassin, Omer, additional, Chen, Lihua, additional, Shukla, Stuti, additional, Zhou, Jierui, additional, Khomane, Ashish R., additional, Gurnani, Rishi, additional, Lei, Ting, additional, Liang, Xidong, additional, Ramprasad, Rampi, additional, Cao, Yang, additional, and Sotzing, Gregory, additional

Published
2023
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13. Semiconductor-Metal Transition in Poly (3,4-Ethylenedioxythiophene): Poly(Styrenesulfonate) and its Electrical Conductivity While Being Stretched

Author

Paziresh, Neda and Sotzing, Gregory Allen

Subjects
Polystyrene -- Chemical properties -- Electric properties -- Mechanical properties, Conducting polymers -- Chemical properties -- Electric properties -- Mechanical properties, Plastic films -- Chemical properties -- Electric properties -- Mechanical properties, Resveratrol, Semiconductors (Materials), Electrical conductivity, Polymers, Engineering and manufacturing industries, Science and technology
Abstract

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT: PSS) film was prepared from an aqueous dispersion of the polymer treated with 5 wt% dimethylsulfoxide (DMSO) on a glass substrate and was electronically characterized in order to study its electronic properties. The electrical resistance of the polymer film was measured over the temperature range (380-10 K) using four-point probe technique. It was noticed that the electrical resistance followed three different trends each of which was indicative of a different charge carrier transport mechanism. Each mechanism was investigated in more detail. A semiconductor to metal transition was also observed at 292 K above which dR/dT had a positive slope. Furthermore, Hall effect, electrical conductivity and sheet resistance measurements were performed on the polymer film using van der Pauw technique. The metallic behavior of PEDOT:PSS at room temperature was further evidenced by the results of these measurements. Next, stretchable knitted fabric was coated with PEDOT:PSS prepared from the polymer dispersion treated with 5 wt% DMSO. The conductive fabric was then stretched axially to different amounts of strain and was electrically characterized in both relaxed and stretched states. Despite the constant decrease in its electrical conductivity, the fabric remained electrically conductive while being stretched under increasing applied strain., INTRODUCTION Various studies have been carried out on poly(3,4-ethylene-dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), some of which are cited here [1-17]. Aleshin et al. [1] showed that PH of the PEDOT:PSS colloidal solution from [...]

Published
2019
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25. Improving the Rotational Freedom of Polyetherimide: Enhancement of the Dielectric Properties of a Commodity High-Temperature Polymer Using a Structural Defect

Author

Alamri, Abdullah, primary, Wu, Chao, additional, Mishra, Ankit, additional, Chen, Lihua, additional, Li, Zongze, additional, Deshmukh, Ajinkya, additional, Zhou, Jierui, additional, Yassin, Omer, additional, Ramprasad, Rampi, additional, Vashishta, Priya, additional, Cao, Yang, additional, and Sotzing, Gregory, additional

Published
2022
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28. Ion-Boosting the Charge Density and Piezoelectric Response of Ferroelectrets to Significantly High Levels

Author

Wang, Ningzhen (author), van Turnhout, J. (author), Daniels, Robert (author), Wu, Chao (author), Huo, Jindong (author), Gerhard, Reimund (author), Sotzing, Gregory (author), Cao, Yang (author), Wang, Ningzhen (author), van Turnhout, J. (author), Daniels, Robert (author), Wu, Chao (author), Huo, Jindong (author), Gerhard, Reimund (author), Sotzing, Gregory (author), and Cao, Yang (author)

Abstract

In contrast to molecular-dipole polymers, such as PVDF, ferroelectrets are a new class of flexible spatially heterogeneous piezoelectric polymers with closed or open voids that act as deformable macro-dipoles after charging. With a spectrum of manufacturing processes being developed to engineer the heterogeneous structures, ferroelectrets are made with attractive piezoelectric properties well-suited for applications, such as pressure sensors, acoustic transducers, etc. However, the sources of the macro-dipole charges have usually been the same, microscopic dielectric barrier discharges within the voids, induced when the ferroelectrets are poled under a large electric field typically via a so-called corona poling, resulting in the separation and trapping of opposite charges into the interior walls of the voids. Such a process is inherently self-limiting, as the reverse internal field from the macro-dipoles eventually extinguishes the microdischarges, resulting in limited density of ions and not too high overall piezoelectric performance. Here, a new method to form ferroelectrets with gigantic electroactivity is proposed and demonstrated with the aid of an external ion booster. A laminate consisting of expanded polytetrafluoroethylene (ePTFE) and fluorinated-ethylene-propylene (FEP) was prefilled with bipolar ions produced externally by an ionizer and sequentially poled to force the separation of positive and negative ions into the open fibrous structure, rendering an impressive piezoelectric d33 coefficient of 1600 pC/N an improvement by a factor of 4 in comparison with the d33 of a similar sandwich poled with nonenhanced corona poling. The (pre)filling clearly increases the ion density in the open voids significantly. The charges stored in the open-cell structure stays at a high level for at least 4 months. In addition, an all-organic nanogenerator was made from an ePTFE-based ferroelectret, with conducting poly(3,4-ethylene dioxythiophene): poly(styrenesulfonate, Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Team Kevin Rossi

Published
2022
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30. Flexible polyolefin dielectric by strategic design of organic modules for harsh condition electrification

Author

Deshmukh, Ajinkya A., primary, Wu, Chao, additional, Yassin, Omer, additional, Mishra, Ankit, additional, Chen, Lihua, additional, Alamri, Abdullah, additional, Li, Zongze, additional, Zhou, Jierui, additional, Mutlu, Zeynep, additional, Sotzing, Michael, additional, Rajak, Pankaj, additional, Shukla, Stuti, additional, Vellek, John, additional, Baferani, Mohamadreza Arab, additional, Cakmak, Mukerrem, additional, Vashishta, Priya, additional, Ramprasad, Rampi, additional, Cao, Yang, additional, and Sotzing, Gregory, additional

Published
2022
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41. Dielectric Polymers Tolerant to Electric Field and Temperature Extremes: Integration of Phenomenology, Informatics, and Experimental Validation

Author

Wu, Chao, primary, Chen, Lihua, additional, Deshmukh, Ajinkya, additional, Kamal, Deepak, additional, Li, Zongze, additional, Shetty, Pranav, additional, Zhou, Jierui, additional, Sahu, Harikrishna, additional, Tran, Huan, additional, Sotzing, Gregory, additional, Ramprasad, Rampi, additional, and Cao, Yang, additional

Published
2021
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48. Wiring of enzymes to electrodes by ultrathin conductive polyion underlayers: enhanced catalytic response to hydrogen peroxide

Author

Yu, Xin, Sotzing, Gregory A., Papadimitrakopoulos, Fotios, and Rusling, James F.

Subjects
Electrodes -- Research, Enzymes -- Research, Chemistry
Abstract

Stable electroactive films were grown layer by layer on rough pyrolytic graphite electrodes featuring 4-nm underlayers of sulfonated polyaniline (SPAN) covered with a film containing myoglobin or horseradish peroxidase grown in alternating layers with poly(styrenesulfonate). The self-doped polyanionic SPAN layer, grown on a 2-nm polycation layer, was conductive between about 0.1 and -0.4 V vs SCE at pH 4.5. The enzyme films had the architecture PDDA/SPAN/[(enzyme/PSS).sub.3], where PDDA is poly(diallyldimethylammonium) ion. Comparisons of voltammetric measurements of electroactive protein with quartz crystal microbalance measurements of total protein showed that 90% or more of the protein was coupled to the electrode when the SPAN underlayer was present, as opposed to ~40% protein electroactivity when SPAN was absent. As a consequence of the highly efficient coupling between enzymes and electrode, the PDDA/SPAN/ [(enzyme/PSS).sub.3] films exhibited a higher sensitivity for the electrochemical catalytic reduction of hydrogen peroxide. Amperometry at a rotating disk electrode at 0 V gave sensitivity for hydrogen peroxide up to 14 [micro]A [micro][M.sup.-1] [cm.sup.-2] in the submicromolar concentration range and a detection limit of ~3 nM. Results suggest the future utility of ultrathin layers of conductive self-doping polyions in improving sensitivity of enzyme biosensors.

Published
2003

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