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1 Polish Journal of Chemistry

1 2007

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UV-Vis and Raman Spectroelectrochemistry of Electrodeposited Polypyrrole in Hexafluorophosphate

Kępas A., Grzeszczuk M., Kvarnström C., Lindfors T., Ivaska A.

Polish Journal of Chemistry

2007

Vol. 81, nr 12

2207-2214

UV-Vis and Raman spectroscopy are very useful and power ful techniques to characterize the structure of conjugated polymers in various states. Spectroelectrochemical measurements were performed in a three-electrode cell containing polypyrrole (PPY) films as active layers in contact with NaPF6 aqueus electrolyte. UV-Vis spectroscopy was used to characterize the neutral (undoped) and oxidized (p-doped) states of polypyrrole upon electrochemical p-doping. Raman measurements were done with the exci tation wave-lengths of 514, 633 and 780 nm. It is shown how the vibrational modes of PPY were in fluenced by the applied laser wave length. The neutral form was found to be strongly resonance en hanced with the 514 nm excitation wave length and the corresponding Raman bands dominate the spectra. Spectra obtained using the 633 nm excitation wave -length displayed a strong contribution of the neutral form, but notice able bands due to the radical cation and dication were also visible. The spectrare orded us ing the 780 nm excitation lineare dominated by Raman bands of the radical cation and dication.