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Electrochemical copolymerization of carbazole and 2,2′:5′-2″ terthiophene: characterization and micro-capacitor application

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Abstract

In this paper, a copolymer of carbazole (Cz) and 2,2′:5′,2″-terthiophene (TTh) was electropolymerized in 0.1 M sodium perchlorate (NaClO4)/acetonitrile (CH3CN) on glassy carbon electrode. The optimum conditions of resulting homopolymers of Cz, TTh and copolymer of Cz and TTh in the initial feed ratio of [Cz]0/[TTh]0 = 1/10 were characterized by cyclic voltammetry, Fourier-transform infrared-attenuated total reflectance, scanning electron microscopy, energy dispersive X-ray analysis, and electrochemical impedance spectroscopy. Morphological analysis of copolymer shows that a micro-spherical and web-like morphology was formed for copolymer at different initial feed ratios of [Cz]0/[TTh]0 = 1/2, 1/5 and 1/10. The capacitive behavior of the modified electrodes was defined via Nyquist, Bode-magnitude, and Bode-phase plots. The highest low-frequency capacitance (C LF) was obtained as 4.11 mFcm−2 in the initial feed ratio of [Cz]0/[TTh]0 = 1/10. Double-layer capacitance (C dl) and phase angles (θ) were obtained for homopolymer and copolymer systems. The highest C dl was obtained as 2.01 mFcm−2 for the copolymer in the initial feed ratio of [Cz]0/[TTh]0 = 1/2. The highest phase angle of copolymer was obtained as θ = ~75° in the initial feed ratio of [Cz]0/[TTh]0 = 1/1. These capacitance results confirmed that films of copolymer Cz/TTh are promising materials for micro-capacitor applications.

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Acknowledgments

Partial financial support for this work by the Research Foundation of Namik Kemal University (Turkey) Project number: NKUBAP.00.10.YL.12.02) is gratefully acknowledged. Authors thank to Dr. A. Gokceoren (ITU, Turkey) for FTIR-ATR and S. Tıkız (TUAM, Turkey) for SEM–EDX measurements.

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  1. Department of Chemistry, Faculty of Arts and Sciences, Namik Kemal University, Degirmenalti Campus, 59030, Tekirdag, Turkey

    Murat Ates & Nuri Eren

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  1. Murat Ates
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  2. Nuri Eren
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Correspondence to Murat Ates.

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Ates, M., Eren, N. Electrochemical copolymerization of carbazole and 2,2′:5′-2″ terthiophene: characterization and micro-capacitor application. Iran Polym J 23, 581–589 (2014). https://doi.org/10.1007/s13726-014-0252-9

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