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Title: Structure-conductivity relationships of iodine-doped polyaniline
Authors: Zeng, X.-R.
Ko, T.-M. 
Keywords: Conducting polymer
Iodine doping
Issue Date: 30-Sep-1997
Citation: Zeng, X.-R.,Ko, T.-M. (1997-09-30). Structure-conductivity relationships of iodine-doped polyaniline. Journal of Polymer Science, Part B: Polymer Physics 35 (13) : 1993-2001. ScholarBank@NUS Repository.
Abstract: Polyaniline, synthesized by using potassium dichromate as the oxidant, was doped with iodine in order to increase its electrical conductivity. The iodine-doped polyanilines attained a conductivity of 1.83 × 10-3 S/cm, which was about eight orders of magnitude greater than that of intrinsic polyaniline. The iodine-doped polyanilines did not absorb moisture readily when compared to the protonic-acid-doped polyanilines. Fourier transform infrared (FTIR) and x-ray photoelectron spectroscopy (XPS) results indicated that iodine-doping reactions occurred at the N-atoms in the quinoid structural units of the polyaniline molecular chains and consequently formed the charge transfer complexes. The iodine in the iodine-doped polyanilines existed mainly in the forms of I3 and I5 anions. As the doping level increased, the relative content of I5 anions increased. Thermogravimetric analysis (TGA) results showed that there was about 6 wt % of iodine strongly bonded to the polyanilines since they would not evolve even at the structural decomposition temperatures of the polymer backbones. Wide-angle x-ray diffraction spectroscopy (WAXD) results revealed that the intrinsic polyaniline was an amorphous polymer but the regularity of polyaniline chains increased after iodine-doping. The iodine-doped polyanilines also showed a decrease in thermal stability. © 1997 John Wiley & Sons, Inc.
Source Title: Journal of Polymer Science, Part B: Polymer Physics
ISSN: 08876266
Appears in Collections:Staff Publications

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