Abstract
Self-assembled polyaniline (PANI) nanotubes were prepared in the presence of three different sulfonic acids as dopant, namely, p-toluenesulfonic acid, camphorsulfonic acid, and tetrakis(4-sulfonatophenyl)porphyrin, by oxidative polymerization using ammonium peroxydisulfate as the oxidant. The morphology of the PANI nanotubes was determined by SEM and TEM and the electrical conductivity was measured as a function of temperature. The PANI nanotubes were also characterized by FTIR, XRD, UV-Vis, and cyclic voltammetry. We have found that the dopants had a noteworthy effect on the electrical conductivity whithout significant changes in the morphology of the PANI nanotubes.
Highlights
Polyaniline is a prototype conducting polymer; it is attractive for electronic applications due to its facile synthesis, environmental stability, unique electronic properties, and simple acid/base doping/dedoping chemistry [1]
We report the effect of dopants such as ptoluenesulfonic acid (TSA), camphorsulfonic acid (CSA), and tetrakis(4-sulfonatophenyl)porphyrin (TSPP) on the electrical conductivity of self-assembled PANI nanotubes
Polyaniline nanotubes have been synthesized in the presence of three different sulfonic acid dopants (TSA, CSA, and TSPP)
Summary
Polyaniline is a prototype conducting polymer; it is attractive for electronic applications due to its facile synthesis, environmental stability, unique electronic properties, and simple acid/base doping/dedoping chemistry [1]. We have demonstrated that the morphology of sulfonated porphyrin doped polyaniline can be changed from one-dimensional nanotube to three-dimensional cauliflower structure by changing the volume ratio of dopant to aniline [2]. Zhang et al have demonstrated that the polymeric acid has significant effect on the morphology and size of the polyaniline nanotubes [5]. We report the effect of dopants such as ptoluenesulfonic acid (TSA), camphorsulfonic acid (CSA), and tetrakis(4-sulfonatophenyl)porphyrin (TSPP) on the electrical conductivity of self-assembled PANI nanotubes. The obtained PANI nanotubes were characterized by measuring electrical conductivity, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy (UVVis), X-ray diffraction (XRD), and cyclic voltammetry
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