Journal of Materials Science

, Volume 50, Issue 4, pp 1836–1847 | Cite as

Electrochemical copolymerization of 3,4-ethylenedioxythiophene and 6-cyanoindole and its electrochromic property

  • Chenxi Li
  • Changlong Liu
  • Liang Shi
  • Guangming NieEmail author
Original Paper


A novel copolymer based on 6-cyanoindole (6CNIn) and 3,4-ethylenedioxythiophene (EDOT) was electrochemically synthesized in acetonitrile containing tetrabutylammonium tetrafluoroborate (TBATFB). The copolymer P(6CNIn-co-EDOT) was characterized by cyclic voltammetry, FT-IR, 1H NMR, SEM, and spectroelectrochemical analysis. According to the results of FT-IR and 1H NMR spectra, the electrochemical copolymerization located at C(2), C(3) position of 6CNIn. Spectroelectrochemical analysis indicates this copolymer film has distinct electrochromic properties, which can convert between brick-red in the reduced state and sky-blue in the oxidized state. Thus, an electrochromic device (ECD) based on P(6CNIn-co-EDOT) and poly(3,4-ethylenedioxythiophene) was also constructed, which had a color change from dark green in neutral state to dark blue in oxidized state. This ECD showed good optical contrast (30 % at 485 nm, 32 % at 610 nm), high coloration efficiency (216 cm2 C−1 at 485 nm, 223 cm2 C−1 at 610 nm), fast response time (0.7 s at 485 nm, 0.9 s at 610 nm), and long-term stability.


Propylene Carbonate Feed Ratio Copolymer Film Cyclic Voltammetry Electrochromic Device 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was supported by National Natural Science Foundation of China (51373089), NSF of Shandong (ZR2011BM003), Specialized Research Fund for the Doctoral Program of Higher Education (20123719120006), Scientific and Technical Development Project of Qingdao (11-2-4-3-(10)-jch), National Training Programs of Innovation and Entrepreneurship for Undergraduates (201410426036).


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Chenxi Li
    • 1
  • Changlong Liu
    • 1
  • Liang Shi
    • 1
  • Guangming Nie
    • 1
    Email author
  1. 1.State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdaoPeople’s Republic of China

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