A stable, low band gap electroactive polymer: poly(4,7-dithien-2-yl-2,1,3-benzothiadiazole)

Atwani, Osman and Barıştıran, Canan and Erden, Ayça and Sönmez, Gürsel (2008) A stable, low band gap electroactive polymer: poly(4,7-dithien-2-yl-2,1,3-benzothiadiazole). Synthetic Metals, 158 (3-4). pp. 83-89. ISSN 0379-6779

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A highly stable electrochromic polymer, poly (4,7-dithien-2-yl-2,1,3-benzothiadiazole), was electrochemically synthesized and its electrochemical, optical and morphological properties are reported. Poly(4,7-dithien-2-yl-2,1,3-benzothiadiazole) showed a very well-defined electrochemistry with a relatively low oxidation potential of the monomer at 0.9 V versus Ag/Ag+, E-1/2 at 0.78 V and stability to long-term switching up to 1000 cycles. The band gap of the polymer films, 1.1 eV, was determined from electrochemistry. Spectroelectrochemistry for p-doped film indicated two absorption peaks at 560 (Vis range) and 1100 nm (NIR) corresponding to pi-pi transition (onset 800 nm) band, and the bi-polarons band, respectively, and a band gap of 1.5 eV. The switching ability and kinetic studies of the polymer prove interesting optical properties in p- and n-doping case with a higher % Delta T at the I 100 nm peak, thus making the polymer a suitable material for NIR applications. Morphology studies on carbon fibers indicated a three-dimensional growth on carbon fibers with a large area determined by the pores suggesting the material to be used in storage devices and biosensors applications. The homogeneity of the polymer film on ITO-coated glass ensures that poly (4,7-dithien-2-yl-2,1,3-benzothiadiazole) is a potential material for electrochromic device applications.
Item Type: Article
Uncontrolled Keywords: low band gap; p- and n-dopable polymer; Spectroelectrochemistry
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Q Science > QC Physics > QC1 General
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Gürsel Sönmez
Date Deposited: 12 May 2010 11:59
Last Modified: 25 Jul 2019 09:01
URI: https://research.sabanciuniv.edu/id/eprint/13942

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