22 July 2003 Electrochemical and microwave characterization of novel 'microwave smart windows' based on poly(3,4-ethylenedioxythiophene) composite materials
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Abstract
Composite materials comprising microparticles of the environmentally stable conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), a transition metal/metal salt redox couple in a solid polymer electrolyte matrix have been prepared and characterised. These materials show rapid and reversible changes in their DC and microwave impedances when small DC or AC fields are applied across them from the edges. The composites may be switched from a high impedance state to a low impedance state with the imposition of hte fields for more t han one thousand switching operations with little or no deterioration in performace. When the fields are removed, the initial high impedance state is restored. The extent of the change is very dependent on the choice of redox pair and also on the composition of the polymer electrolyte phase. Copper has been shown to give the largest changes in microwave impedance from 750Ω at 0V to 5Ω at 5V. In this paper, we present a series of waveguide results for composites containing 26wt% PEDOT together with a comparison with other conducting polymer composites, the effect of redox couple on the extent of switching and a proposed mechanism for the switching process.
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Alan Barnes, Rong Zhang, Peter Victor Wright, Barry Chambers, "Electrochemical and microwave characterization of novel 'microwave smart windows' based on poly(3,4-ethylenedioxythiophene) composite materials", Proc. SPIE 5055, Smart Structures and Materials 2003: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (22 July 2003); doi: 10.1117/12.483583; https://doi.org/10.1117/12.483583
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