Abstract
The attenuated total reflection infrared (ATR-IR) spectra oftrans-polyacetylene (trans-PA) film doped with sodium (n-doping) were observed in the range of 1900 to 700 cm−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 1010 cm−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 880 cm−1 (due to CC stretching) regions for Nadoped PA. In particular, a weak band of C=C stretching at 1600 cm−1 was newly obtained for the first time in the present study. The electro conductivity of the dopedtrans-PA film was 102 S/cm and the origins of doping-induced IR bands are discussed in terms of solitons and polarons.
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