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AIP Advances / Volume 2 / Issue 1 / REGULAR ARTICLES
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AIP Advances 2, 012127 (2012); http://dx.doi.org/10.1063/1.3681299 (8 pages)

Polyaniline nano-composites with large negative dielectric permittivity

Chia-Hung Hsieh1, An-Hung Lee1, Cheng-Dar Liu2, Jin-Lin Han3, Kuo-Huang Hsieh2, and Sung-Nung Lee1

1Department of Chemistry, Fu-Jen Catholic University, Taipei, Taiwan
2Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan
3Department of Chemical and Material Engineering, National I-Lan University, I-Lan, Taiwan

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(Received 7 November 2011; accepted 21 December 2012; published online 19 January 2012)

Two polyaniline (PANI)/polymer nano-composites exhibiting huge negative dielectric permittivity have been synthesized for the first time. These novel chemical processes open a new approach for fabrication of the negative index materials (NIMs), since most of the NIMs prepared today are obtained by a structural approach – by putting together two structured materials that exhibit separately a negative permittivity and a negative permeability. We found the negative permittivity of these nano-composites is a function of the content of the dopant (i.e., PANI) as well as of the frequency. The generation of huge negative permittivity can be rationalized by the well-dispersed PANI-DBSA nano-particles which form a pseudo-continuous conductive pathway in these nano-composites.

© 2012 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License.

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KEYWORDS, PACS, and IPC

Keywords

nanocomposites, nanoparticles, permeability, permittivity, polymers

PACS

  • 81.07.-b

    Nanoscale materials and structures: fabrication and characterization

  • 77.22.Ch

    Permittivity (dielectric function)

  • 81.05.Qk

    Reinforced polymers and polymer-based composites

International Patent Classification (IPC)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3681299

PUBLICATION DATA

ISSN

2158-3226 (online)

Publisher:

American Institute of Physics is a Member of CrossRef is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
Schematic representation of the micellar structures, (a) regular micelle (b) reversed micelle.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Dispersion of dielectric permittivity of various PANI-DBSA/PAA nano-composites with different PANI contents, synthesized by reversed micelle process.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
SEM images of PANI-DBSA/PAA nano-composites of different PANI contents, synthesized by reversed micelle process: (a) 4wt% (b) 8wt% (c) 16wt% (d) 30wt%.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Electrical conductivities of PANI-DBSA/PAA composites of different PANI contents. (a) samples synthesized from different mediums and measured under 500Hz. (b) samples synthesized from organic medium and measured under different AC frequencies.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
Dispersion of dielectric permittivity of various PANI-DBSA/PAA nano-composites, synthesized from aqueous medium.

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.6
SEM images of PANI-DBSA/PAA nano-composites of different PANI contents, synthesized from aqueous medium: (a) 4wt%, (b) 8wt%, (c) 16wt%, (d) 30wt%.

FIG.6 Download High Resolution Image (.zip file) | Export Figure to PowerPoint





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