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Radiation-Induced Synthesis of Nanostructured Conjugated Polymers in Aqueous Solution: Fundamental Effect of Oxidizing Species

Authors

  • Dr. Youssef Lattach,

    1. Laboratoire de Chimie Physique, LCP, UMR 8000, CNRS, Université Paris-Sud 11, Bât. 349, Campus d'Orsay, 15 Avenue Jean Perrin, 91405 Orsay Cedex (France)
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  • Cecilia Coletta,

    1. Laboratoire de Chimie Physique, LCP, UMR 8000, CNRS, Université Paris-Sud 11, Bât. 349, Campus d'Orsay, 15 Avenue Jean Perrin, 91405 Orsay Cedex (France)
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  • Dr. Srabanti Ghosh,

    1. Laboratoire de Chimie Physique, LCP, UMR 8000, CNRS, Université Paris-Sud 11, Bât. 349, Campus d'Orsay, 15 Avenue Jean Perrin, 91405 Orsay Cedex (France)
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  • Prof. Samy Remita

    Corresponding author
    1. Laboratoire de Chimie Physique, LCP, UMR 8000, CNRS, Université Paris-Sud 11, Bât. 349, Campus d'Orsay, 15 Avenue Jean Perrin, 91405 Orsay Cedex (France)
    2. Département CASER, Ecole SITI, Conservatoire National des Arts et Métiers, CNAM, 292 rue Saint-Martin, 75141 Paris Cedex 03 (France)
    • Laboratoire de Chimie Physique, LCP, UMR 8000, CNRS, Université Paris-Sud 11, Bât. 349, Campus d'Orsay, 15 Avenue Jean Perrin, 91405 Orsay Cedex (France)

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Abstract

Synthesis of conjugated poly(3,4-ethylenedioxythiophene) (PEDOT) polymers is achieved through the radiolysis of N2O-saturated aqueous solutions of 3,4-ethylenedioxythiophene by using two different oxidizing species: HO. (hydroxyl) and N3. (azide) radicals. Both oxidative species lead to self-assembled polymers that are evidenced in solution by cryotransmission electron microscopy and UV/Vis absorption spectroscopy and, after centrifugation and deposition, by scanning electron microscopy and attenuated total reflectance FTIR techniques. Whereas HO. radicals lead to PEDOT-OH globular nanostructures with hydrophilic properties, N3. radicals enable the formation of amphiphilic PEDOT-N3 fibrillar nanostructures. These results, which highlight the differences in the intermolecular interaction behaviors of the two kinds of PEDOT polymers, are discussed in terms of polymerization mechanisms.

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