Authors: Chen, Wei-Te; Bowmaker, Graham A.; Seakins, John M.; Cooney, Ralph P.

Source: Applied Spectroscopy, Volume 56, Issue 7, Pages 171A-186A and 809-961 (July 2002) , pp. 909-915(7)

Publisher: Society for Applied Spectroscopy

Abstract:

Far-infrared, mid-infrared, and Raman spectroscopy were used to characterize iodine-doped poly(isothianaphthene) (PITN) films and powders. The far-infrared and mid-infrared results show changes from absorption mode to reflective mode as the doping level increases, consistent with the iodine-doped PITN becoming more metallic and more conductive at higher doping levels. The far-IR and Raman (514.5-nm laser excitation) results show that I₃^- is dominant in iodine-doped PITN. The Raman spectral changes observed using 1064-nm excitation are different from those measured using 514.5-nm excitation. The spectra recorded with 514.5-nm excitation show features due to the undoped parts of the polymer, and these indicate that the effective conjugated chain length decreases with increased doping. The Raman spectra obtained by using 1064-nm excitation show features due to polaron and bipolaron states in the doped polymer.

Keywords: INFRARED; RAMAN; CONDUCTING POLYMER

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370202760171590

Publication date: 2002-07-01

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