PET fabric/polypyrrole composite with high electrical conductivity for EMI shielding

M. S. Kim, H. K. Kim, S. W. Byun, S. H. Jeong, Y. K. Hong, J. S. Joo, K. T. Song, J. K. Kim, C. J. Lee, J. Y. Lee

Research output: Contribution to journalArticlepeer-review

287 Citations (Scopus)


Polypyrrole (PPy) was polymerized chemically and electrochemically in sequence on a polyester (PET) woven fabric, giving rise to PET fabric/PPy composite with high electrical conductivity. In the chemical polymerization, pyrrole dissolved in an aqueous solution without or with polyvinyl alcohol as a surfactant was first sprayed on the PET fabric and oxidized by spraying an aqueous solution of an oxidant and a dopant. Electrochemical polymerization was carried out in an aqueous electrolyte solution by applying a constant current density to the PET fabric coated with chemically polymerized PPy and a stainless steel plate as the working and the counter electrodes, respectively. We investigated the effects of the chemical or the electrochemical polymerization conditions on the properties of the resulting composite such as surface morphology, electrical conductivity, environmental stability, and electromagnetic interference shielding effectiveness (EMI SE). We found that the composite shielded EMI by absorption as well as reflection and that EMI shielding through reflection increased with the electrical conductivity. The specific volume resistivity of the composite prepared in this study was extremely low as 0.2 Ω cm and EMI SE was in the practically useful range of about 36dB over a wide frequency range up to 1.5 GHz.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalSynthetic Metals
Issue number2-3
Publication statusPublished - 2002 Feb 14

Bibliographical note

Funding Information:
We would like to acknowledge the financial support of Dual Use Technology Program by Ministry of Commerce, Industry and Energy (1999), Korea.


  • EMI shielding
  • Electrically conducting composite
  • PET woven fabric
  • Polypyrrole

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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