Browsing by Author "Us, Cansu N."

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A Camouflage Material: P- and N-Type Dopable Furan Based Low Band Gap Electrochromic Polymer and Its Edot Based Copolymer
(Pergamon-elsevier Science Ltd, 2015) Kavak, Emrah; Us, Cansu N.; Yavuz, Ejmer; Kivrak, Arif; Ozkut, Merve Icli
A Donor-Acceptor-Donor (D-A-D) type monomer, 4,9-di(furan-2-yl)-6,7-diphenyl-[1,2,5]thiadiazolo[3,4g] quinoxaline (1), was synthesized via Stille Coupling reaction and polymerized electrochemically. The obtained polymer (P1) has low band gap (0.85 eV) and showed electrochromic property (pale mustard-colored in neutral state, grey in oxidized state and brown in reduced state). Moreover, copolymerization of 1 was carried out with EDOT for the formation of P(1-co-EDOT) which exhibits higher electrochemical stability than its homopolymer (P1) and have intriguing electrochromic property with a color change from the tunes of brown to the tunes of green. The band gap of copolymer was calculated as 1.1 eV. (C) 2015 Elsevier Ltd. All rights reserved.
Expanding the Realm of Soluble Narrow Band Gap Polymers With a Benzobisthiadiazole Derivative
(Amer Chemical Soc, 2016) Us, Cansu N.; Ozkut, Merve Icli
A donor acceptor donor based soluble and narrow band gap pi-conjugated electrochromic polymer, poly(4,8-bis(3,3-dihexyl-3,4-dihydro-2H-thieno [3,4-b] [1,4] dioxepin-5-yl)b enzo [1,2c;4,5-c']bis[1,2,5]thiadiazole) (P1), was electrochemically (P1-E) and chemically (P1-C) synthesized. Cyclic voltammetry and UV-vis-NIR absorption measurements showed that P1 has a low band gap ranging from 0.59 to 1.1 eV, depending on the band gap determination and synthesis (chemical or electrochemical) methods. P1 demonstrated an ambipolar electrochemical behavior. The color of the polymer was gray in its neutral state and switched to green (first oxidation state) and blue (second oxidation state) upon oxidation and to brown upon reduction.