Syntheses of conducting polymer nanoparticles in supercritical carbon dioxide as a solvent

Makoto Yuasa, Yasuhiro Yokota, Taro Araki, Yuka Isaji, Hidenori Murata, Atsushi Shono, Katsuto Otake

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4 Citations (Scopus)


Nanoparticles of conductive polypyrrole (PPy) and its derivatives such as 3-heptylpyrrole (HPy) were successfully synthesized in a homogeneous supercritical carbon dioxide (scCO2). The homogeneous supercritical state was confirmed by observations of the phase behavior of the system through a high-pressure cell with a viewing window. Therefore, it became possible to synthesize their nanoparticles without the use of an organic solvent. The size of nanoparticles in the system decreased with more addition of CO2. This result suggested that the density of CO2 plays an important role in the control of the particle size.

Original languageEnglish
Pages (from-to)513-518
Number of pages6
Issue number11
Publication statusPublished - 1 Dec 2009


  • Nanoparticle
  • Poly (3-heptylpyrrole)
  • Polypyrrole
  • Supercritical carbon dioxide

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