A chemically diverse conducting polymer-based "electronic nose"

Michael S. Freund, Nathan S. Lewis

Research output: Contribution to journalArticlepeer-review

280 Citations (Scopus)


We describe a method for generating a variety of chemically diverse broadly responsive low-power vapor sensors. The chemical polymerization of pyrrole in the presence of plasticizers has yielded conducting organic polymer films whose resistivities are sensitive to the identity and concentration of various vapors in air. An array of such sensing elements produced a chemically reversible diagnostic pattern of electrical resistance changes upon exposure to different odorants. Principal component analysis has demonstrated that such sensors can identify and quantify different airborne organic solvents and can yield information on the components of gas mixtures.

Original languageEnglish
Pages (from-to)2652-2656
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number7
Publication statusPublished - Mar 28 1995


  • Olfaction
  • Plasticizers
  • Poly(pyrrole)
  • Principal component analysis
  • Sensor arrays

ASJC Scopus subject areas

  • General

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