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<p>Simple and environmentally friendly synthetic method of polypyrrole (PPy) microtubes were proposed. First, sucrose microfibers coated by PPy overlayer were synthesised by solvent-free vapor-phase coupling polymerization of pyrrole (Py) monomer using solid oxidant in the presence of sucrose microfibers with a diameter of approximately 4&#xa0;μm without any liquid media. Next, selective extraction of sucrose core component from the sucrose-core/PPy-sheath microfibers using water resulted in the formation of PPy microtubes. The sheath thickness of PPy microtubes increased from 168&#xa0;nm to 209&#xa0;nm by controlling relative humidity during the polymerization from 10 to 40%. Furthermore, the sheath thickness increased from 73&#xa0;nm to 207&#xa0;nm with an increase of the polymerization time from 4&#xa0;h to 24&#xa0;h. The capacitance of PPy microtubes (157.0&#xa0;F g<sup>−1</sup>) was approximately three times higher than that of the bulk PPy films (52.2&#xa0;F g<sup>−1</sup>), thanks to good accessibility of ions in the electrolyte to the PPy surface due to their hollow structure. The PPy microtubes synthesized in this study are expected to be applied as electrodes for energy storage devices such as capacitors and lithium-ion secondary batteries and soft micropump.</p> Graphical Abstract <p></p>

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Polypyrrole microtubes synthesized by vapor-phase coupling polymerization

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Ryuga Sakabe,
  • Ryuto Sugiura,
  • Koji Mitamura,
  • Seiji Watase,
  • Tomoyasu Hirai,
  • Yoshinobu Nakamura,
  • Yuya Oaki,
  • Syuji Fujii

摘要

Simple and environmentally friendly synthetic method of polypyrrole (PPy) microtubes were proposed. First, sucrose microfibers coated by PPy overlayer were synthesised by solvent-free vapor-phase coupling polymerization of pyrrole (Py) monomer using solid oxidant in the presence of sucrose microfibers with a diameter of approximately 4 μm without any liquid media. Next, selective extraction of sucrose core component from the sucrose-core/PPy-sheath microfibers using water resulted in the formation of PPy microtubes. The sheath thickness of PPy microtubes increased from 168 nm to 209 nm by controlling relative humidity during the polymerization from 10 to 40%. Furthermore, the sheath thickness increased from 73 nm to 207 nm with an increase of the polymerization time from 4 h to 24 h. The capacitance of PPy microtubes (157.0 F g−1) was approximately three times higher than that of the bulk PPy films (52.2 F g−1), thanks to good accessibility of ions in the electrolyte to the PPy surface due to their hollow structure. The PPy microtubes synthesized in this study are expected to be applied as electrodes for energy storage devices such as capacitors and lithium-ion secondary batteries and soft micropump.

Graphical Abstract