A Caltech Library Service

A chemically diverse conducting polymer-based "electronic nose"

Freund, Michael S. and Lewis, Nathan S. (1995) A chemically diverse conducting polymer-based "electronic nose". Proceedings of the National Academy of Sciences of the United States of America, 92 (7). pp. 2652-2656. ISSN 0027-8424. PMCID PMC42276. doi:10.1073/pnas.92.7.2652.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription CentralArticle
Freund, Michael S.0000-0003-1104-2292
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 1995 National Academy of Sciences. Communicated by Robert H. Grubbs, California Institute of Technology, Pasadena, CA, November 28, 1994. We thank Profs. J. J. Hopfield and J. M. Bower, and the members of their research groups, for helpful discussions. This work was supported in part by the Caltech Consortium in Chemistry and Chemical Engineering; E. I. DuPont de Nemours and Company, Inc., the Eastman Kodak Company, National Aeronautics and Space Administration, and National Science Foundation Grant CHE-9202583. This is contribution no. 8952. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Funding AgencyGrant Number
Caltech Consortium in Chemistry and Chemical EngineeringUNSPECIFIED
E. I. DuPont de Nemours and Company, Inc.UNSPECIFIED
Eastman Kodak CorporationUNSPECIFIED
Subject Keywords:sensor arrays; olfaction; principal component analysis; poly(pyrrole); plasticizers
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Chemistry and Chemical Engineering8952
Issue or Number:7
PubMed Central ID:PMC42276
Record Number:CaltechAUTHORS:20141203-144657553
Persistent URL:
Official Citation:M S Freund and N S Lewis A chemically diverse conducting polymer-based "electronic nose". PNAS 1995 92 (7) 2652-2656; doi:10.1073/pnas.92.7.2652
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52354
Deposited By: Tony Diaz
Deposited On:03 Dec 2014 23:12
Last Modified:19 Apr 2023 21:27

Repository Staff Only: item control page