Flattened-Top Domical Droplet Formed by a Poly(pyrrole) Membrane

Hyejeong Kim, Kiwoong Kim, Sang Joon Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Polypyrrole (PPy) is a promising conductive polymer (CP) with electrical versatility, easy synthesis and functionalization, stability, and biocompatibility. Diverse architectures have been adopted to improve PPy performance, but the direct and precise patterning of various architectures remains challenging. Here, the unique formation of a PPy membrane on the air/water interface of a droplet solution containing ammonium persulfate and phytic acid is investigated. When a PPy thin film forms on the air/water interface, the top of the droplet rapidly flattens. The formation procedure and final structure of the PPy thin film are visualized and quantitatively investigated. Unlike the typical globular structure of PPy, the self-assembled PPy film surface fabricated in this study is very organized and regularly shaped. This well-ordered membrane may have a very high buckling strength greater than the surface tension of the solution. The proposed precise fabrication method is simple and inexpensive for fabricating patterned functional membranes. These results provide new insight into the fabrication of CP and their applications in various practical electromaterial engineering fields.

Original languageEnglish
Article number1800707
JournalMacromolecular Materials and Engineering
Issue number3
Publication statusPublished - 2019 Mar
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP). (number 2017R1A2B3005415)

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • conducting polymers
  • hydrogels
  • microstructures
  • self-assembly
  • thin films

ASJC Scopus subject areas

  • General Chemical Engineering
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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