Impedance analysis of polymer composites of PEDOT and natural polysaccharides
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We invesigate impedance characteristics of polymer composites of poly(3,4-ethylenedioxythiphene) (PEDOT) and natural polysaccharides (carrageenan). Polymerization was done with molar 1:1 ratio of EDOT and the monomeric unit of carrageenan dissolved in deionized water in presence of sodium persulfate and ferric sulfate. Carrageenans are in either kappa, iota, and lambda form depending on the number of ester sulfate group. We used these forms of the carrageenans to study the effects of the numbers of sulfate groups on the impedance properties of the conducting polymer composites. All composites are dark blue, indicating that PEDOT is synthesized and doped. We then prepared thin films of thes composites and analyzed their electrochemical characteristics by using electrochemical impedance spectroscopy and modified Randles circuit. We observed that the low-frequency responses were mainly affected by the number of sulfate groups.