Understanding the role of the gas in the voids during corona charging of cellular electret films: A way to enhance their piezoelectricity

Mika Paajanen, Michael Wegener, Reimund Gerhard-Multhaupt

Research output: Contribution to journalArticleScientificpeer-review

162 Citations (Scopus)

Abstract

The influence of the corona-charging process on the piezoelectric transducer coefficient d33 of a cellular electret film has been investigated. An increased corona voltage can be considered as a way to enhance the charge density and thus also the resulting piezoelectric effect. Higher corona-charging voltages are possible with increased ambient pressure or in suitable dielectric gases. The effect of the gas inside the voids has also been studied. Enhanced transducer coefficients were obtained by corona charging in N2 or N2O gas atmospheres at 100-450 or 100-140 kPa pressures, respectively. The highest transducer coefficients of about 790 pCN-1 were obtained when N2 gas was filled into the voids of a cellular polymer film by means of consecutive vacuum and high-pressure treatments at 295 or 313 K.
Original languageEnglish
Pages (from-to)2482-2488
Number of pages7
JournalJournal of Physics D: Applied Physics
Volume34
Issue number16
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

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Electrets
electrets
piezoelectricity
Piezoelectricity
coronas
charging
voids
Gases
gases
Transducers
transducers
coefficients
Piezoelectric transducers
piezoelectric transducers
Electric potential
electric potential
Charge density
Polymer films
Vacuum
atmospheres

Cite this

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title = "Understanding the role of the gas in the voids during corona charging of cellular electret films: A way to enhance their piezoelectricity",
abstract = "The influence of the corona-charging process on the piezoelectric transducer coefficient d33 of a cellular electret film has been investigated. An increased corona voltage can be considered as a way to enhance the charge density and thus also the resulting piezoelectric effect. Higher corona-charging voltages are possible with increased ambient pressure or in suitable dielectric gases. The effect of the gas inside the voids has also been studied. Enhanced transducer coefficients were obtained by corona charging in N2 or N2O gas atmospheres at 100-450 or 100-140 kPa pressures, respectively. The highest transducer coefficients of about 790 pCN-1 were obtained when N2 gas was filled into the voids of a cellular polymer film by means of consecutive vacuum and high-pressure treatments at 295 or 313 K.",
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Understanding the role of the gas in the voids during corona charging of cellular electret films : A way to enhance their piezoelectricity. / Paajanen, Mika; Wegener, Michael; Gerhard-Multhaupt, Reimund.

In: Journal of Physics D: Applied Physics, Vol. 34, No. 16, 2001, p. 2482-2488.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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AU - Paajanen, Mika

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AB - The influence of the corona-charging process on the piezoelectric transducer coefficient d33 of a cellular electret film has been investigated. An increased corona voltage can be considered as a way to enhance the charge density and thus also the resulting piezoelectric effect. Higher corona-charging voltages are possible with increased ambient pressure or in suitable dielectric gases. The effect of the gas inside the voids has also been studied. Enhanced transducer coefficients were obtained by corona charging in N2 or N2O gas atmospheres at 100-450 or 100-140 kPa pressures, respectively. The highest transducer coefficients of about 790 pCN-1 were obtained when N2 gas was filled into the voids of a cellular polymer film by means of consecutive vacuum and high-pressure treatments at 295 or 313 K.

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