Synthesis and effect of secondary dopant on the conductivity of conducting polymer polyaniline

Kedir Mamma; Khalid Siraj; Nathan Meka

doi:10.1515/polyeng-2013-0098

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Synthesis and effect of secondary dopant on the conductivity of conducting polymer polyaniline

Kedir Mamma , Khalid Siraj and Nathan Meka

Published/Copyright: November 23, 2013

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From the journal Journal of Polymer Engineering Volume 33 Issue 9

Abstract

Polyaniline (PANI) in its emeraldine salt form was synthesized by chemical method from aniline monomer in the presence of HCl mixed with LiCl and ammonium persulfate as oxidant. Then, a portion of sample was dedoped with NH₃ solution and another equal portion was separately postdoped with secondary dopants, such as H₂SO₄ and HClO₄, respectively. Finally, the dried samples of PANI prepared in all its three different forms (emeraldine salt form, undoped emeraldine base, and the two secondary doped forms of PANI) were characterized by UV-visible spectroscopy, cyclic voltammetry (CV) techniques, Fourier transform infrared (FT-IR) spectroscopy, and electrical conductivity measurement. The cyclic voltammograms of PANI in its emeraldine base (PANI-EB) determined the electrochemical behavior and the growth mechanisms of the polymer. The FT-IR and UV-vis spectra confirmed the expected structural modification up on doping, undoping, and postdoping processes of the polymer. Their measured electrical conductivities were from 0.02 for undoped, 156 for primary doped form, and increasing from 158 to 257 S/cm for those secondary doped PANI. The influence of secondary doping on the electrical conductivity was also investigated from their spectroscopic data which shows dramatic rise in conductivity. The result also shows that secondary doping increased the π conjugation.

Keywords: cyclic voltammetry; electrical conductivity; emeraldine base; emeraldine salt; PANI; secondary dopant

Corresponding author: Khalid Siraj, Department of Chemistry, College of Natural Sciences, Jimma University, P.O. Box 378, Jimma, Ethiopia, e-mail: khalid.siraj@ju.edu.et

We are thankful to the Department of Chemistry, College of Natural Science, Jimma University, Ethiopia, for providing necessary facilities for carrying out this research.

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Received: 2013-4-16

Accepted: 2013-10-8

Published Online: 2013-11-23

Published in Print: 2013-12-01

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Articles in the same Issue

https://doi.org/10.1515/polyeng-2013-0098

Keywords for this article

cyclic voltammetry; electrical conductivity; emeraldine base; emeraldine salt; PANI; secondary dopant