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    Electrochemical characteristics of azo dyes doped poly(3,4-Ethylenedioxythiophene)
    (Biointerface Research Applied Chemistry, 2020) Dülgerbaki, Çiğdem; Kömür, Ali Ihsan; Eren, Esin; Tkach, Volodymyr Valentynovych; Skrypska, Olga, V; Kushnir, Marta, V; Öksüz, Ayşegül Uygun
    In the present study, the electrosynthesis and the electrochemical characterization of azo dyes doped poly(3,4-ethylenedioxythiophene (PEDOT) were described. PEDOT film was electrochemically deposited onto indium doped tin oxide (ITO) coated/glass electrode, following azo dyes adsorption. The electropolymerized-PEDOT films on ITO glass were doped with carious azo dyes; 4-Phenylazo-2-phenyliminomethyl-phenol (PAPM), 4-Phenylazo-2-(p-tolyimino-methyl)-phenol (PATM) and 4-[(2-Hydroxy-5-phenylazo-benzylidene)-amino]-benzenesulfonicacid (HPAB). The structures of azo dyes-doped PEDOT ere characterized via cycle voltammograms and electrochemical impedance spectroscopy (EIS). Diverse doping counterions have a significant influence on the electrochemical behaviour of electropolymerized-PEDOT film. The electropolymerized-PEDOT doped by HPAB (PEDOT-HPAB) film possesses higher electrochemical activity than other azo dye-doped PEDOT composites. The main characteristics of PEDOT-azo dyes films contain uniformity, durability, and adherent on ITO electrodes. which are better when it is compared to PEDOT film.
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    Electrochromic strategy for tungsten oxide/polypyrrole hybrid nanofiber materials
    (Pergamon-Elsevier Science Ltd, 2018) Dülgerbaki, Çiğdem; Maslakçı, Neslihan Nohut; Kömür, Ali İhsan; Öksüz, Ayşegül Uygun
    High-quality hybrid nanofibers were fabricated with the aim of studying their feasibility as electrochromic systems. Tungsten oxide/polypyrrole films were electrochemically synthesized into four different ionic liquids: 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (BMIMTFSI), and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMPTFSI), followed by electrospinning deposition. The influence of ionic liquid on the morphology of formed hybrid nanofiber samples was observed by scanning electron microscopy (SEM) measurements. Energy dispersive X-ray spectroscopy (EDX) was also employed to confirm the compositions of nanofibers. Electrochromic devices fashioned from these hybrid nanofiber arrays were found to display remarkable electrochromic performance with reversible color change, fast optical modulation and superior cycling stability. These improvements can be attributed to the high porosity of the nano fibers, their larger accessible surface area and rational combination of two electrochemically active materials. PPy/WO3/BMIMPF6 based device showed marked enhancement of electrochromic contrast and coloration efficiency over other nanofiber based devices: the transmittance change of 47.41% along coloration efficiency of 329.45 cm(2)/C. These synergistic organic-inorganic nanostructures pave the way for forming new materials to be used in advanced applications.