Improving electrochromic properties via copolymerization

Date

2010-06-01

Author

Taskin, Asli Tuba
Balan, Abidin
Udum, Yasemin Arslan
Toppare, Levent Kamil

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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.

Subject Keywords

Signal Processing, Electrical and Electronic Engineering, General Materials Science, Atomic and Molecular Physics, and Optics, Mechanics of Materials, Civil and Structural Engineering, Condensed Matter Physics

URI

https://hdl.handle.net/11511/37571

Journal

SMART MATERIALS & STRUCTURES

DOI

https://doi.org/10.1088/0964-1726/19/6/065005

Collections

Department of Chemistry, Article

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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: https://hdl.handle.net/11511/37571.