Piezoelectric Properties of Ferroelectret

Tajitsu, Y.

doi:10.1080/00150193.2011.577372

Cited by 14 publications

(16 citation statements)

References 12 publications

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“…32,33 It must be noted, that the maximum values of piezoelectric coefficients obtained here, are 2-4 times lower than those reported previously. [27][28][29] The discrepancy can be explained by different measurement techniques and conditions. For example in Ref.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

“…Cellular polypropylene is already an established ferroelectret material, whereas piezoelectricity in polyethylene is very seldom studied. [27][28][29] The available data indicate that PE ferroelectrets exhibited 33 coefficients comparable to those of PP ferroelectrets, albeit with slightly lower thermal stability. Besides, the global trends in production and pricing of both materials show that polypropylene will stay more expensive than polyethylene and its production will shrink in favor of PE.…”

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confidence: 97%

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Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Rychkov

Altafim

Qiu

et al. 2012

Journal of Applied Physics

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Ferroelectrets have been fabricated from low-density polyethylene (LDPE) films by means of a template-based lamination. The temperature dependence of the piezoelectric d33 coefficient has been investigated. It was found that low-density polyethylene ferroelectrets have rather low thermal stability with the piezoelectric coefficient decaying almost to zero already at 100 °C. This behavior is attributed to the poor electret properties of the polyethylene films used for the fabrication of the ferroelectrets. In order to improve the charge trapping and the thermal stability of electret charge and piezoelectricity, LDPE ferroelectrets were treated with orthophosphoric acid. The treatment resulted in considerable improvements of the charge stability in LDPE films and in ferroelectret systems made from them. For example, the charge and piezoelectric-coefficient decay curves shifted to higher temperatures by 60 K and 40 K, respectively. It is shown that the decay of the piezoelectric coefficient in LDPE ferroelectrets is governed by the relaxation of less stable positive charges. The treatment also leads to noticeable changes in the chemical composition of the LDPE surface. Infrared spectroscopy reveals absorption bands attributed to phosphorus-containing structures, while scanning electron microscopy shows new island-like structures, 50–200 nm in diameter, on the modified surface.

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Section: Samples and Experimental Proceduresmentioning

confidence: 99%

mentioning

confidence: 97%

Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Rychkov

Altafim

Qiu

et al. 2012

Journal of Applied Physics

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“…A value of 935 pC/N was obtained for S2n‐6.4‐TPT1. To the best of our knowledge, this piezoelectric coefficient is very high compared to the literature available on polyethylene ferroelectrets (around 400 pC/N), and better than the best coefficients obtained for PP ferroelectrets (800 pC/N), which are the most developed ferroelectrets. The results are in agreement with the literature stating that the piezoelectric activity is inversely proportional to the cell AR .…”

Section: Resultsmentioning

confidence: 46%

“…A value of 935 pC/N was obtained for S2n-6.4-TPT1. To the best of our knowledge, this piezoelectric coefficient is very high compared to the literature available on polyethylene ferroelectrets (around 400 pC/N), [39][40][41] and better than the best coefficients obtained for PP ferroelectrets (800 pC/N), 31…”

Section: Morphology Effect On the Piezoelectric Coefficient And Elamentioning

confidence: 55%

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Piezoelectric property improvement of polyethylene ferroelectrets using postprocessing thermal‐pressure treatment

Hamdi

Mighri

Rodrigue

2018

Polymers for Advanced Techs

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In this work, biaxially stretched polymer foams with well‐defined cellular structures were prepared from polyethylene via blown‐film extrusion and subjected to corona charging to produce a piezoelectric response. The charging parameters were first optimized in terms of charging voltage and needle distance, as well as the gas type and pressure to investigate their effect on the piezoelectric coefficient (d33). The results show that samples charged under nitrogen (N2) at 100 kPa had better d33 coefficient than those charged under ambient air or N2 at 20 kPa. Moreover, 2 different thermal pressure treatments were imposed to obtain an optimized eye‐like cellular structure with different cell aspect ratios (AR). The results showed that when the cells were elongated in both the longitudinal and transverse directions (higher AR), higher d33 coefficients were achieved. From all the samples produced, the best results were obtained for a longitudinal aspect ratio (AR‐L) of 7.1, a transversal aspect ratio (AR‐T) of 4.6, and a relative foam density of 0.52 leading to a d33 coefficient of 935 pC/N. This coefficient was further increased using reverse charging and multilayered films, reaching a maximum of 2550 pC/N. This value is much higher than typical ones reported so far for any polyethylene and polypropylene ferroelectrets. These results could increase the use of polyethylene in piezoelectric applications as these materials are very attractive for the large‐scale production of electret‐based sensors and transducers due to their low cost and easy processing.

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Piezoelectric Polymeric Foams as Flexible Energy Harvesters: A Review

Ansari

Somdee

2022

Adv Energy and Sustain Res

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Piezoelectric energy harvesters (PEHs) have the potential to power low‐power electronic devices and can advance, self‐powered, autonomous electronics to the next level. Conventional ceramic‐based piezoelectrics have various properties such as fragility, rigidity, toxicity, high density, and lack of design flexibility which limit their use in more flexible environments. A ton of research has been carried out and published on novel piezomaterials, their transduction mechanisms, analytical models, and electrical circuits to improve various aspects of PEHs. Among these materials, studies on polymeric cellular (or foamed) ferroelectrets or piezoelectrets as PEHs have grown significantly since their discovery. Also, very limited or short reviews are available covering only few aspects. There is a necessity of recognizing their past and present advances in their various generation technology and polymer systems. Herein, a broader review of almost all conventional and recent polymeric foam‐based piezoelectrics for PEH applications is summarized. These cellular polymer piezoelectric systems either in bulk, composite, layered, or film form can be fabricated, and depending on the application and conditions, different polymers groups, mainly, polyolefins, polyester, fluoropolymer, and others, are considered. Their applications and future perspectives are also presented and discussed.

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Piezoelectric Properties of Ferroelectret

Cited by 14 publications

References 12 publications

Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Piezoelectric property improvement of polyethylene ferroelectrets using postprocessing thermal‐pressure treatment

Piezoelectric Polymeric Foams as Flexible Energy Harvesters: A Review

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