Corona charging of polymers

Giacometti, J.A.; Oliveira, Osvaldo N.

doi:10.1109/14.256470

Cited by 189 publications

(91 citation statements)

References 95 publications

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“…9 According to our knowledge, this work is pioneering because it assesses the electric characterization of different dielectric materials using the CC method. Our experimental setup was designed for measurements using electroded samples, i.e., under the closed circuit condition.…”

Section: Discussionmentioning

confidence: 99%

“…In the 1980's, a corona triode was built which allowed dielectric samples to be charged with a CC, under an open circuit. [6][7][8] In addition to charging control, this corona triode permitted the investigation of electrical properties of polymers 9,10 and even to obtain hysteresis curves for ferroelectric polymers. 11 In this work, the CC method is applied in measurements under the closed circuit condition, i.e., with electroded samples.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of the CC is that the Maxwell total current equation can be, in some cases, analytically integrated and the charge transport and trapping in insulators may be theoretically treated. 9,12 The connection between the CC and voltage methods is briefly discussed in Ref. 13.…”

Section: Introductionmentioning

confidence: 99%

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Electric measurements with constant current: A practical method for characterizing dielectric films

Giacometti

Wisniewski

Ribeiro

et al. 2001

Review of Scientific Instruments

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This article assesses the use of the constant current ͑CC͒ method for characterizing dielectric films. The method is based on charging the sample with a constant current ͑current stress͒ and measuring the corresponding voltage rise under the closed circuit condition. Our article shows that the CC method is an alternative to the constant voltage stressing method to study the electric properties of nonpolar, ferroelectric, and polar polymers. The method was tested by determining the dielectric constant of polytetrafluoroethylene, and investigating the electric conduction in poly͑ethylene terephthalate͒. For the ferroelectric polymer poly͑vinylidene fluoride͒, it is shown that hysteresis loops and the dependence of the ferroelectric polarization on the electric field can be obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electric measurements with constant current: A practical method for characterizing dielectric films

Giacometti

Wisniewski

Ribeiro

et al. 2001

Review of Scientific Instruments

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“…At the same time, the corona discharge forms water-soluble, low-molecular-weight, oxidized materials (LMWOM). According to [16] Positively or negatively charged oxygen-containing ions deposited on the sample surface, during the charging process, generate a constant electric field in the sample volume. This additional electric field can induce additional charges or cause orientation of charged structures (such as zeolite nanoparticles) in the volume.…”

Section: Theorymentioning

confidence: 99%

Holographic recording in charged photopolymerisable nanocomposites

Yovcheva¹,

Vlaeva²,

Sainov³

et al. 2010

AIP Conference Proceedings

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Abstract. The holographic recording properties of charged zeolite containing photopolymerisable nanocomposites were studied. Photopolymer samples doped with pure silica MFI-type zeolite nanoparticles were charged using corona discharge. The holographic properties of the nanocomposites were characterised in real time using the Stetson geometry of recording. The influence of the type of charge -positive or negative on the dynamics of holographic recording and the final diffraction efficiency was studied.

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“…In the corona method-which has been extensively used for charging polymers, 10 treating polymer surfaces, 11,12 in electrophotocopying machines, 13 and in electrostatic filters, 14 -a high voltage is applied to an electrode such as a metallic point. 15 Excited neutral species and positive or negative ions, depending on the voltage polarity, are produced in a region near the corona point.…”

Section: Introductionmentioning

confidence: 99%

Doping of Polyaniline by Corona Discharge

1997

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In the present article it is shown that a corona discharge can be employed to dope thin films of polyaniline ͑PANI͒ coated on poly͑ethylene terephthalate͒ films, allowing the electrical conductivity to be tuned within the range 10 Ϫ10 to 0.3 S cm Ϫ1. A study of the effect of different corona conditions, namely corona treatment for positive and negative polarities, air humidity, treatment time, corona current, and the geometry of the corona triode, on the electrical conductivity of the polyaniline is presented. The results indicate that the corona discharge leads to protonic doping of polyaniline similar to that which occurs in conventional protonic acid solution doping. Atomic force microscopic analysis shows that, as the PANI is exposed to the corona discharge, its globular morphology is disrupted leading to the appearance of droplet-like features and a significant decrease in the average height and surface roughness. Doping by corona discharge presents several advantages over the conventional solution method namely that it is a dry process which does not require use of chemicals reagents, and which is both rapid and avoids dopant migration. The latter can be important for applications of PANI in microelectronic devices.

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Corona charging of polymers

Cited by 189 publications

References 95 publications

Electric measurements with constant current: A practical method for characterizing dielectric films

Electric measurements with constant current: A practical method for characterizing dielectric films

Holographic recording in charged photopolymerisable nanocomposites

Doping of Polyaniline by Corona Discharge

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