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Radio frequency functional capacitors made of all-organic composites of thiourea in field-responsive polymers
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Figures

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FIG. 1.

(a) Morphology of TU-in-SMA matrix composite thin film. (b) Fractal-like morphology of SMA-acrylic terpolymer composite with embedded TU. (c) Spherulites of PVDF in polycyanoacrylate matrix. (d) PVDF fibrillar network in polycyanoacrylate matrix.

Image of FIG. 2.

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FIG. 2.

(a) Capacitance vs frequency and (b) loss tangent vs frequency characteristics of capacitors made of six model composites (see Table I).

Image of FIG. 3.

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FIG. 3.

(a) Frequency dependent impedance (curves a and ) and phase angle (curves b and ) data for composite systems 2 and 5, respectively, in Table I. The unlabeled curve shows the impedance characteristics of a commercial film for comparison (Ref. 7). (b) Current-voltage data for the composite systems 2 (curve a) and 5 (curve b). The inset shows the circuit model of the capacitors with estimated parasitics.

Tables

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Table I.

Composition details (relative weight fractions) of all-organic composite films studied.

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/content/aip/journal/apl/92/8/10.1063/1.2857498
2008-02-26
2014-04-23

Abstract

By incorporating an organic high dielectric constant ferroelectric crystal, thiourea, in field-responsive polymers, we fabricated radio frequency functional all-organic and solution-processable dielectriccomposites. Two field-responsive polymer matrices with polyvinylidene fluoride (PVDF) and -conjugated tris(8-hydroxyquinoline)aluminum(III) inclusions were used to fabricate six model high-capacitordevices. Promising frequency-independent capacitance density of about up to with an estimated was obtained from the model systems except when thin interpenetrating PVDF crystals formed within the amorphous matrix. These structures displayed significantly lower capacitance density . High-composites with low loss tangent could be implemented in flexible electronics.

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Scitation: Radio frequency functional capacitors made of all-organic composites of thiourea in field-responsive polymers
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/8/10.1063/1.2857498
10.1063/1.2857498
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