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Proceedings Paper

Characterization of smart microwave window materials based on conducting polymer composites: coaxial line, waveguide, and cyclic voltammetry measurements
Author(s): Alan Barnes; Peter Victor Wright; Anthony Despotakis; K. Lees; Barry Chambers
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Paper Abstract

Discs of polyaniline-silver-polymer electrolyte composites exhibit rapid and reversible changes in their microwave impedance when small electric fields are applied across then in a resonant coaxial line test set. The experimental data show that the initial conductivity of the materials is dependent on the concentration of silver metal and suggests that changes in resistance due to chemical switching take plane, at least in part, in the manufacture of the composites. The experimental data show that changes in the gradient of the cyclic voltammograms coincide with large changes in microwave reflectivity consistent with increasing conductivity of the composite when fields are applied. The reverse change occurs when the fields are removed. Measurements of the switching speed have shown that the composites are able to switch between the different states at in times of less than a second for more than one million switching operations with no depreciation of the material. Large area films have also been studied in the front of waveguide devices and measured in a microwave transmission mode. The results show that large changes in microwave impedance occur with the application of small electric fields (~ 15 V cm-1).

Paper Details

Date Published: 20 July 1998
PDF: 9 pages
Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); doi: 10.1117/12.316868
Show Author Affiliations
Alan Barnes, Univ. of Sheffield (United Kingdom)
Peter Victor Wright, Univ. of Sheffield (United Kingdom)
Anthony Despotakis, Univ. of Sheffield (United Kingdom)
K. Lees, Univ. of Sheffield (United Kingdom)
Barry Chambers, Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 3324:
Smart Structures and Materials 1998: Smart Materials Technologies
Manfred R. Wuttig, Editor(s)

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