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Molecular orientation in electrodeposited polypyrrole films

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Abstract

The molecular arrangement in electrodeposited polypyrrole films was studied by means of linear dichroism in the near-edge X-ray absorption fine structure (NEXAFS) spectra measured at the K absorption edges of carbon and nitrogen. It has been found that the change of the exciting radiation incidence from normal to grazing leads to an increase in the intensity of π*-related resonances with simultaneous decrease in the intensity of σ*-related resonances in the spectra. Similar changes in the spectra measured for both absorption edges indicate a pronounced conjugation of π-bonds in the polypyrrole chains in the grown films. Preferential in-plane orientation of pyrrole rings relative to the substrate surface is observed for all the deposited films. The linear dichroism is more pronounced at the initial stages of deposition (2D growth) than at later stages characterized by “cauliflower”-like morphology of the grown film.

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Acknowledgements

We are thankful to Dr. A.A. Shakov and Dr. N.V. Lyalina (Physical-Technical Institute, UB RAS, Izhevsk, Russia) for their help during experiments.

Funding

This work was supported by FASO of Russia within the state assignment No. АААА-А17-117022250038-7, Russian Foundation for Basic Research project No.16-43-180228, and bilateral Program “Russian-German Laboratory at BESSY II.”

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Authors and Affiliations

  1. Physical-Technical Institute, Udmurt Federal Research Center, Ural Branch of Russian Academy of Sciences, 132 Kirov Street, Izhevsk, 426000, Russia

    A. V. Syugaev & A. N. Maratkanova

  2. Institut für Festkörperphysik, Technische Universität Dresden, Physikgebäude, Zellescher Weg 16, 01069, Dresden, Germany

    D. A. Smirnov

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  1. A. V. Syugaev
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Correspondence to A. V. Syugaev.

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Syugaev, A.V., Maratkanova, A.N. & Smirnov, D.A. Molecular orientation in electrodeposited polypyrrole films. J Solid State Electrochem 22, 2127–2134 (2018). https://doi.org/10.1007/s10008-018-3925-z

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  • DOI: https://doi.org/10.1007/s10008-018-3925-z

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