Electrochromic properties of a novel low band gap conductive copolymer

Date

2007-07-10

Author

Yigitsoy, Basak
Varis, Serhat
Tanyeli, Cihangir
Akhmedov, Idris M.
Toppare, Levent Kamil

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A copolymer of 2,5-di(thiophen-2-yl)-1-p-tolyl-1H-pyrrole (DTTP) with 3,4-ethylene dioxythiophene (EDOT) was electrochemically synthesized. The resultant copolymer P(DTTP-co-EDOT) was characterized via cyclic voltammetry, FTIR, SEM, conductivity measurements and spectroelectrochemistry. Copolymer film has distinct electrochromic proper-ties. It has four different colors (chestnut, khaki, camouflage green, and blue). At the neutral state; gimel(max) due to the pi-pi* transition was found to be 487 nm and E-g was calculated as 1.65 eV. Double potential step chronoamperometry experiment shows that copolymer film has good stability, fast switching time (less than 1 s) and good optical contrast (20%). An electrochromic device based on P(DTTP-co-EDOT) and poly(3,4-ethylenedioxythiophene) (PEDOT) was constructed and characterized. The device showed reddish brown color at -0.6 V when the P(DTTP-co-EDOT) layer was in its reduced state; whereas blue color at 2.0 V when PEDOT was in its reduced state and P(DTTP-co-EDOT) layer was in its oxidized state. At 0.2 V intermediate green state was observed. Maximum contrast (%Delta T ) and switching time of the device were measured as 18% and 1 s at 615 nm. ECD has good environmental and redox stability.

Subject Keywords

Electrochemistry, General Chemical Engineering

URI

https://hdl.handle.net/11511/41430

Journal

ELECTROCHIMICA ACTA

DOI

https://doi.org/10.1016/j.electacta.2007.04.083

Collections

Department of Chemistry, Article

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Citation Formats

B. Yigitsoy, S. Varis, C. Tanyeli, I. M. Akhmedov, and L. K. Toppare, “Electrochromic properties of a novel low band gap conductive copolymer,” ELECTROCHIMICA ACTA, pp. 6561–6568, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41430.