Electrochemical copolymerization of N-methylpyrrole and 2,2 '-bithitiophene; characterization, micro-capacitor study, and equivalent circuit model evaluation


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ATEŞ M., Arican F., Karazehir T.

BULLETIN OF MATERIALS SCIENCE, vol.36, no.7, pp.1281-1290, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 36 Issue: 7
  • Publication Date: 2013
  • Doi Number: 10.1007/s12034-013-0609-2
  • Title of Journal : BULLETIN OF MATERIALS SCIENCE
  • Page Numbers: pp.1281-1290

Abstract

N-methylpyrrole (N-MPy) and 2,2'-bithiophene (BTh) were electrocopolymerized in 0 center dot 2 M acetonitrile-sodium perchlorate solvent-electrolyte couple on a glassy carbon electrode (GCE) by cyclic voltammetry (CV). The resulting homopolymers and copolymers in different initial feed ratios of [N-MPy](0)/[BTh](0) = 1/1, 1/2, 1/5 and 1/10 were characterized by CV, Fourier-transform infrared reflectance attenuated transmittance (FTIR-ATR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and electrochemical impedance spectroscopy (EIS). The capacitive behaviours of the modified electrodes were defined via Nyquist, Bode-magnitude, Bode-phase and admittance plots. The equivalent circuit model of R(C(R)(QR)(CR)) was performed to fit theoretical and experimental data. The highest low-frequency capacitance (C (LF)) were obtained as C (LF) = similar to 1 center dot 23 x 10 (-4) mF cm (-2) for P(N-MPy), C (LF) = similar to 2 center dot 09 x 10 (-4) mF cm(-2) for P(BTh) and C (LF) = similar to 5 center dot 54 x 10 (-4) mF cm(-2) for copolymer in the inital feed ratio of [N-MPy](0)/[BTh] (0) = 1/2.