Synthesis of 5-(3,6-di(thiophene-2-yl)-9H-carbazole-9-yl)pentane-1-amine and Electrochemical Impedance Spectroscopy

Abstract

In this article, 5-(3,6-di(thiophene-2-yl)-9H-carbazole-9-yl) pentane-1-amine, (ThCzPA) comonomer was newly synthesized and characterized by Fourier transform infrared reflectance-attenuated total reflection spectroscopy (FTIR-ATR) and ¹H-NMR spectroscopy. ThCzPA was electrochemically deposited onto carbon fiber micro electrode (CFME). Poly(ThCzPA)/CFME is characterized by Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS). Capacitive behaviors of modified CFMEs were defined via Nyquist, Bode-magnitude and Bode-phase plots. The equivalent circuit model of R(Q(R(QR)(Q(RW))) was used for polymer-electrolyte system. The effect of monomer concentration (0.5, 1.0 and 1.5 mM) on the formation of alternating copolymer is reported in 0.1 M sodium perchlorate (NaClO₄)/acetonitrile (ACN) solution. The highest low frequency capacitance (C_LF = 5.07 µF cm⁻² for R(Q(R(QR)(Q(RW))) was obtained in the initial monomer concentration of 1.5 mM.

Keywords:

• Circuit model
• Coatings
• Electrical properties
• Electrochemical properties
• Thin films

ACKNOWLEDGMENTS

This work was supported by The Scientific & Technological Research Council of Turkey. (TUBITAK) – TBAG- 110T516 Project. The authors also thank to Prof. Dr. A. Sezai Sarac (Istanbul Technical University, Electropol. Laboratory, Istanbul, Turkey) for opportunity to use laboratory facilitates.

Notes

Deposition charges (Q/mC), anodic and cathodic peak potential difference (Ep_a − Ep_c/V) and anodic and cathodic current density ratios (i_a/i_c) were determined.

Monomers deposited electrochemically at a scan rate of 100 mVs⁻¹, using multiple (8 cycle) in 0.1 M NaClO₄/ACN.