Surface characterization, electrochromic and capacitive properties of poly(N-(4-(4-thieno[3,2-b]thiophen-3-yl-phenyl)phenyl)-N-phenylbenzenamine) film

Sebahat Topal, Esma Sezer, Mehmet S. Eroglu, Turan Ozturk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

N-(4-(4-thieno [3,2-b]thiophen-3-yl-phenyl)phenyl)-N-phenylbenzenamine (TTpTPA), synthesized by Suzuki cross-coupling reaction, was electropolymerized in DCM/CAN (4/1 v/v) mixture, containing 0.1 M Bu4NPF6. Charge storage property of the polymer, investigated by electrochemical impedance spectroscopy measurements at different potentials, suggested that the highest capacitance value could be obtained at its anodic peak potentials. Double layer and low-frequency capacitances were found to be CDL = 369 Fg-1 and CLF = 447 Fg-1 at EDC = 1.23 V. These values are in good agreement with the results obtained from equivalent circuit model. Electrochromic properties of the corresponding polymer, PolyTTpTPA, were investigated by spectroelectrochemical measurements, which indicated that while the polymer had a gold-orange color in its neutral state with an absorption maximum of 378 nm, it became blue in its oxidized state with an absorption maximum of 850 nm. Chronocoulometric measurement of the film exhibited a residence time of 10 s, indicating a fast response time and stable photoelectrochemical behavior, which are the most important parameters for electrochromic applications. In addition, hydrophobic property of the film, having a contact angle measurement of 115°, is a good advantage for electronic applications for outdoor and wet areas. This work demonstrates that reversible capacitive current property and porous structure of PolyTTpTPA, supported by SEM and AFM images, make it a good candidate for electrochromic and capacitor devices.

Original languageEnglish
Article number122954
JournalPolymer
Volume209
DOIs
Publication statusPublished - 17 Nov 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Capacitance
  • Cyclic voltammetry
  • EIS
  • Electrochromic
  • Electropolymerization
  • Thienothiophene
  • Triphenylamine

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