Electromagnetic interference shielding efficiency of polyaniline mixtures and multilayer films

C. Y. Lee, H. G. Song, K. S. Jang, E. J. Oh, A. J. Epstein, J. Joo

Research output: Contribution to journalConference articlepeer-review

199 Citations (Scopus)


Electromagnetic interference shielding efficiency (SE) of the mixtures of polyaniline (PAN) and conducting powders such as silver (Ag), graphite, and carbon black is measured in the frequency range from 10 MHz to 1 GHz by using ASTM D4935-89 technique. The measured SEs of the mixtures are from 20 dB to 50 dB, which agree with theoretical values obtained from a good-conductor approximation. The SEs of the system increase with increasing DC conductivity. For the mixture of emeraldine base form of PAN and Ag powder doped with hydrochloric acid, the SE is approx. 46 dB with approx. 70 μm thickness. Chemical doping in PAN mixture samples induces the increase of the SE. The model accounting for the increase of the SE in the mixture system is discussed. The effects of multilayer of PAN on the SE are presented.

Original languageEnglish
Pages (from-to)1346-1349
Number of pages4
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 1999
EventProceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier
Duration: 1998 Jul 121998 Jul 18

Bibliographical note

Funding Information:
This work was partly supported by the CRM-KOSEF and KOSEF (Grant No. 971-0210-043-2).

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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