Improving electrochromic properties via copolymerization

Taskin, Asli Tuba
Balan, Abidin
Udum, Yasemin Arslan
Toppare, Levent Kamil
Copolymers of 5,8-di(1H-pyrrol-2-yl)-2,3-di(thiophen-2-yl) quinoxaline (PTQ) in the presence of 2,2'-bis(3,4-ethylenedioxythiophene) (BiEDOT) and 4,7-bis(2,3-dihydrothieno[3,4-b][1,4] dioxin-5-yl)-2-dodecyl-2H-benzo[1,2,3] triazole (BEBT) were synthesized via the potentiodynamic method in a tetrabutylammonium perchlorate/dichloromethane (TBAP/DCM) (0.1 M) solvent-electrolyte couple. P(PTQ-co-BiEDOT) reveals an oxidation potential at +0.45 V and a reduction potential at -0.2 V (figure 1(a)), whereas the homopolymer, P(PTQ) has an oxidation potential of +0.55 V and a reduction potential of +0.1 V. Spectroelectrochemical behaviors and the switching ability of copolymers were investigated by ultraviolet-visible (UV-vis) spectroscopy and cyclic voltammetry. The spectroelectrochemical behaviors of the P(PTQ-co-BiEDOT) and P(PTQ-co-BEBT) in comparison to the homopolymer revealed solid evidence of copolymerization based upon the differences in the spectral signatures. P(PTQ-co-BEBT) reveals 80% optical contrast at 1450 nm whereas the homopolymer achieves only 66% at 1460 nm. Coloration efficiency of P(PTQ-co-BEBT) was found to be 132 cm(2) C(-1) compared to 116 cm(2) C(-1) of the homopolymer at 100% full switch in the visible region. Switching times of the polymers were evaluated by kinetic studies upon measuring the per cent transmittance (%T) at the maximum contrast point. P(PTQ-co-BEBT) switches between the two extreme states in 0.5 s compared to 1.2 s for the homopolymer.


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Kolay, Merve; Tarkuc, Simge; Udum, Yasemin Arslan; Toppare, Levent Kamil (IOP Publishing, 2011-07-01)
Two new polythieno[3,4-b]pyrazine derivatives, poly-10,12-bis(4-hexylthiophen-2-yl)dibenzo[f,h]thieno[3,4-b]quinoxaline (PDBTQ) and poly-8,10-bis(4-hexylthiophen-2-yl)acenaphtho[1,2-b]thieno[3,4-e]pyrazine (PATP) were synthesized by electrochemical polymerization and their electrochemical properties reported. Electroactivity of the monomer and electrochemical redox behavior of its polymers were investigated by cyclic voltammetry. Spectroelectrochemical analysis was performed and the band gaps of the polymer...
Optoelectrochemical properties of poly(5,12-dihydrothieno[3 ',4 ':2,3][1,4] dioxocino[6,7-b]quinoxaline-co-2,2 ' bithiophene) and its electrochromic device application
Ak, Metin; Ak, Mine Sulak; GÜLLÜ, Mustafa; Toppare, Levent Kamil (IOP Publishing, 2007-12-01)
In this study we investigated the electrochromic properties and electrochromic device application of poly(5,12-dihydrothieno[3',4':2,3][1,4]dioxocino[6,7-b]quinoxaline (DDQ)-co-2,2'-bithiophene (13T)). Copolymerization was successfully achieved electrochemically in acetonitrile containing 0.1 M tetrabutyl ammonium tetrafluoroborate as the supporting electrolyte by direct anodic oxidation on platinum and indium tin oxide coated glass electrodes. The structure and morphology of the copolymer were investigated...
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Citation Formats
A. T. Taskin, A. Balan, Y. A. Udum, and L. K. Toppare, “Improving electrochromic properties via copolymerization,” SMART MATERIALS & STRUCTURES, pp. 0–0, 2010, Accessed: 00, 2020. [Online]. Available: