Electret properties of polyethylene and polytetrafluoroethylene films with chemically modified surface

Rychkov, Dmitry; Kuznetsov, Alexey; Rychkov, A. A.

doi:10.1109/tdei.2011.5704487

Cited by 45 publications

(18 citation statements)

References 27 publications

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“…This could be related to the fact that a "crossover" phenomenon does not exist in modified LDPE samples. 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.…”

Section: Samples and Experimental Procedurescontrasting

confidence: 71%

“…Similar results have recently been obtained on polyethylene and polytetrafluoroethylene after various chemical modifications. 32,33,36 Thus, chemical treatment can obviously enhance the thermal stability of electrets from these materials. In ferroelectrets, such treatments should improve the thermal stability of the piezoelectricity.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

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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 Procedurescontrasting

confidence: 71%

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

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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show abstract

“…Under these conditions, according to[7], the derivative of the surface-potential with respect to temperature gives the image of the energy spectrum of the surface traps. Therefore the shifting of the potential decay curves to the higher temperatures can be attributed to the formation of the new deeper traps on the modified surface.Normally, the improvement in the thermal stability of the electret charge is accompanied by the corresponding improvement of the temporal stability [1,4,5]. In our experiments the long-term temporal stability of the electret charge has also been enhanced (see inset of theFig.…”

mentioning

confidence: 50%

“…978-1-4577-1025-4/11/$26.00 ©2011 IEEE In [4] it has been shown that the modification of LDPE surfaces with phosphorus trichloride vapor helps to eliminate the so called "crossover phenomenon", inherent to all polyethylene electrets. In non-modified LDPE films the decay rate of the surface potential is strongly dependent on its initial value.…”

Section: Methodsmentioning

confidence: 99%

“…The last fact precludes the use of LDPE electrets in many modem applications. Recently, however, it has been shown [4] that low density polyethylene films treated with phosphorus trichloride vapor have considerably higher stability of the electret homocharge. In addition to that, the "crossover phenomenon" inherent to all LDPE coronoelectrets, is completely non-existent in the modified films.…”

Section: Introductionmentioning

confidence: 99%

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Electret properties of polyethylene films modified with titanium tetrachloride vapor

Rychkov

Kuznetsov

Rychkov

et al. 2011

2011 - 14th International Symposium on Electrets

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Low density polyethylene films have been treated with titanium tetrachloride vapor by means of the molecular layer deposition method. It has been shown that such a treatment leads to a considerable improvement of the electret properties. The thermal stability of the electret homocharge has been increased by 60°C. At the same time, the temporal stability of charge is also improved. The modified low density polyethylene films show no "crossover phenomenon" when charged to higher voltages. Thus it is now possible to produce electrets from polyethylene films with high values of the initial charge density without a detrimental influence on the charge stability.

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Properties and Applications of Ferroelectrets

Qiu

Rychkov

Wirges

2015

The Nano‐Micro Interface

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Electret properties of polyethylene and polytetrafluoroethylene films with chemically modified surface

Cited by 45 publications

References 27 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

Electret properties of polyethylene films modified with titanium tetrachloride vapor

Properties and Applications of Ferroelectrets

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