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Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers

Seggern, Heinz von ; Zhukov, Sergey ; Ben Dali, Omar ; Hartmann, Claas ; Sessler, Gerhard M. ; Kupnik, Mario (2022)
Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers.
In: Polymers, 2022, 13 (21)
doi: 10.26083/tuprints-00019969
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
Language: English
Date: 2 May 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: MDPI
Journal or Publication Title: Polymers
Volume of the journal: 13
Issue Number: 21
Collation: 14 Seiten
DOI: 10.26083/tuprints-00019969
Corresponding Links:
Origin: Secondary publication DeepGreen

Piezoelectrets are artificial ferroelectrics that are produced from non-polar air-filled porous polymers by symmetry breaking through high-voltage-induced Paschen breakdown in air. A new strategy for three-layer polymer sandwiches is introduced by separating the electrical from the mechanical response. A 3D-printed grid of periodically spaced thermoplastic polyurethane (TPU) spacers and air channels was sandwiched between two thin fluoroethylene propylene (FEP) films. After corona charging, the air-filled sections acted as electroactive elements, while the ultra-soft TPU sections determined the mechanical stiffness. Due to the ultra-soft TPU sections, very high quasi-static (22,000 pC N⁻¹) and dynamic (7500 pC N⁻¹) d₃₃ coefficients were achieved. The isothermal stability of the d₃₃ coefficients showed a strong dependence on poling temperature. Furthermore, the thermally stimulated discharge currents revealed well-known instability of positive charge carriers in FEP, thereby offering the possibility of stabilization by high-temperature poling. The dependences of the dynamic d₃₃ coefficient on seismic mass and acceleration showed high coefficients, even at accelerations approaching that of gravity. An advanced analytical model rationalizes the magnitude of the obtained quasi-static d₃₃ coefficients of the suggested structure indicating a potential for further optimization.

Uncontrolled Keywords: ferroelectret, piezoelectret, fluoropolymer, elastomer, FEP, TPU
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-199691
Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
18 Department of Electrical Engineering and Information Technology > Measurement and Sensor Technology
Date Deposited: 02 May 2022 11:25
Last Modified: 14 Nov 2023 19:04
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19969
PPN: 505649217
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