Characteristics and Mechanisms in Ion-Conducting Polymer Films as Chemical Sensors

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Solid Polymer Electrolytes (SPE) are widely used in batteries and fuel cells because of the high ionic conductivity that can be achieved at room temperature. The ions are usually Li or protons, although other ions can be shown to conduct in these polymer films. There has been very little published work on SPE films used as chemical sensors. The authors have found that thin films of polymers like polyethylene oxide (PEO) are very sensitive to low concentrations of volatile organic compounds (VOCs) such as common solvents. Evidence of a new sensing mechanism involving the percolation of ions through narrow channels ... continued below

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38 p.

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Hughes, Robert C.; Yelton, William G.; Pfeifer, Kent B. & Patel, Sanjay V. July 12, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico
  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Livermore, CA (United States)
    Place of Publication: Livermore, California

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Description

Solid Polymer Electrolytes (SPE) are widely used in batteries and fuel cells because of the high ionic conductivity that can be achieved at room temperature. The ions are usually Li or protons, although other ions can be shown to conduct in these polymer films. There has been very little published work on SPE films used as chemical sensors. The authors have found that thin films of polymers like polyethylene oxide (PEO) are very sensitive to low concentrations of volatile organic compounds (VOCs) such as common solvents. Evidence of a new sensing mechanism involving the percolation of ions through narrow channels of amorphous polymer is presented. They present impedance spectroscopy of PEO films in the frequency range 0.0001 Hz to 1 MHz for different concentrations of VOCs and relative humidity. They find that the measurement frequency is important for distinguishing ionic conductivity from the double layer capacitance and the parasitic capacitance.

Physical Description

38 p.

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OSTI as DE00759880

Medium: P; Size: 38 pages

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  • Journal Name: The Electrochemical Society; Other Information: Submitted to The Electrochemical Society

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  • Report No.: SAND2000-1630J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 759880
  • Archival Resource Key: ark:/67531/metadc704006

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  • July 12, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 2:34 p.m.

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Hughes, Robert C.; Yelton, William G.; Pfeifer, Kent B. & Patel, Sanjay V. Characteristics and Mechanisms in Ion-Conducting Polymer Films as Chemical Sensors, article, July 12, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc704006/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.