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Effect of electric-field-assisted thermal annealing of poly(4-vinylphenol) film on its dielectric constant
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Figures

Image of FIG. 1.

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FIG. 1.

Current density–electric field characteristic of Al/PVP/Al device (schematic view), characterized at in situ (◻) and at room temperature (◼). The dielectric strength was defined as the electric field at which the leakage current density exceeds (the horizontal dashed line). The vertical dashed line represents the electric field applied to the PVP films during electric field-assisted thermal annealing.

Image of FIG. 2.

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FIG. 2.

Capacitance of Al/PVP/Al device as a function of frequency measured after thermal annealing (, ) with (○) and without(●) treatment with an ac electric field with a minimum voltage of and highest voltage of . The schematic view inside illustrates this waveform.

Image of FIG. 3.

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FIG. 3.

Imaginary part of dielectric constant as a function of frequency measured at in situ. The measured complex impedance values were transformed into complex dielectric permittivity formalism.

Image of FIG. 4.

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FIG. 4.

Dielectric constant determined under various electric field-assisted annealing conditions: thermal annealing (, ) without electric field, with dc field of , and with ac fields with a minimum voltage of and highest voltage of at various frequencies (schematic view in Fig. 2).

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2008-03-12
2014-04-17

Abstract

We investigated the effect of annealing a polymericdielectric film in the presence of an oscillating electric field on its dielectric constant.Films were prepared with the vertical structure of electrode/poly(4-vinylphenol)/electrode and annealed at a temperature above the glass transition temperature while applying an acelectric field ranging from at various frequencies in the hope of altering the arrangement of polymer chains through conformational transitions influenced by the orientational polarization of the polar phenol groups. It was found that the dielectric constant increased significantly by about 30% when the annealing frequency corresponded to that at which dielectric relaxation takes place effectively.

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Scitation: Effect of electric-field-assisted thermal annealing of poly(4-vinylphenol) film on its dielectric constant
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/10/10.1063/1.2896603
10.1063/1.2896603
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