Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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ATR-Infrared Spectroscopic Study of n-Doped Polyacetylene Films

  • Kim, Jin-Yeol (School of Advanced Materials Engineering, Kookmin University) ;
  • Kim, Jae-Taek (School of Advanced Materials Engineering, Kookmin University) ;
  • Kwon, Min-Hee (School of Advanced Materials Engineering, Kookmin University) ;
  • Han, Dong-Kyu (School of Advanced Materials Engineering, Kookmin University) ;
  • Kwon, Si-Joong (R&D Center, Nanoenics Inc.)
  • Published : 2007.02.28
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Abstract

The attenuated total reflection infrared (ATR-IR) spectra of trans-polyacetylene (trans-PA) film doped with sodium (n-doping) were observed in the range of 1900 to $700cm^{-1}$. The observed IR bands were attributed to negatively charged domains created by n-doping electrons. The doping-induced IR bands showed considerable difference from its pristine film. After doping, the out-of-plane CH deformation band of the strong $1010cm^{-1}$ region in the pristine film disappeared while several new bands were observed at 1600 (due to C=C stretching), 1400 (due to in-plane CH bending), 1290 and 1174 (due to CH stretching), and $880cm^{-1}$ (due to CC stretching) regions for Na-doped PA. In particular, a weak band of C=C stretching at $1600cm^{-1}$ was newly obtained for the first time in the present study. The electro conductivity of the doped trans-PA film was $10^2S/cm$ and the origins of doping-induced IR bands are discussed in terms of solitons and polarons.

Keywords

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