Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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The 1320-nm Excited FT-Raman Spectra of Lightly Iodine-Doped trans-Polyacetylene

  • Kim, Jin-Yeol (Department of Chemistry, College of Natural Science, Hanyang Univ.) ;
  • Yukio Furukawa (Department of Chemistry, School of Scienceand Engineering, Waseda Univ.) ;
  • Akira Sakamoto (Department of Chemistry, Faculty of Science, Saitama Univ.) ;
  • Mitsuo Tasumi (Department of Chemistry, Faculty of Science, Saitama Univ.)
  • Published : 2002.10.01
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Abstract

The FT-Raman spectra of trans-polyacetylene films doped lightly with iodine were obtained with the 1320-nm laser line. The observed Raman bands are attributed to positively charged domains created by acceptor doping. The observed Raman wavenumbers of the V$_2$, (CC stretch), V$_3$, and V$_4$ bands (mixed of CC stretch and CH in-plan bending) of iodine-doped form are slightly higher than those of the corresponding bands of pristine trans-polyacetylene, whereas the contrary is the case for V$_1$, and (C=C stretch) of iodine-doped form. In particular, these upshifts of the V$_2$ and V$_3$ bands are distinguished from the downshifts of these bands in donor doping. The origin of doping induced Raman bands is discussed in terms of solitons and polarons.

Keywords

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