Characterization of smart microwave window materials based on conducting polymer composites: coaxial line, waveguide, and cyclic voltammetry measurements

Alan Barnes; Peter Victor Wright; Anthony Despotakis; K. Lees; Barry Chambers

doi:10.1117/12.316868

20 July 1998 Characterization of smart microwave window materials based on conducting polymer composites: coaxial line, waveguide, and cyclic voltammetry measurements

Alan Barnes, Peter Victor Wright, Anthony Despotakis, K. Lees, Barry Chambers

Author Affiliations +

Proceedings Volume 3324, Smart Structures and Materials 1998: Smart Materials Technologies; (1998) https://doi.org/10.1117/12.316868
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

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).

Citation Download Citation

Alan Barnes, Peter Victor Wright, Anthony Despotakis, K. Lees, and Barry Chambers "Characterization of smart microwave window materials based on conducting polymer composites: coaxial line, waveguide, and cyclic voltammetry measurements", Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); https://doi.org/10.1117/12.316868

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