Chemical sensing through measurement of thickness/impedance characteristics of ion-conducting polymer films

Clay Macomber, Michael Eastman, T. L. Porter, K. Manygoats, William G Delinger

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A chemical microsensor system capable of simultaneously measuring the impedance and thickness of thin polymer films exposed to analyte vapors is described. The system is constructed from a quartz substrate with interdigitated electrodes and a piezoresistive microcantilever. Measurements of the thickness and impedance of 10-30 μm thick films of LiClO4 doped polyethyleneoxide (PEO) exposed to water, ethanol, acetone, and n-octane are reported. Experiments show that the thickness and impedance measurements are complementary and that thickness/impedance profiles allow the identification and quantification of the analytes tested. Scanning force microscopy (SFM) shows that PEO lamellae become smaller as the level of LiClO4 doping increases. SFM also shows an increase in the amount of amorphous material increases when doped PEO is exposed to water vapor. The uniqueness of the thickness/impedance profiles for the analytes is discussed in terms of the SFM results.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume150
Issue number8
DOIs
StatePublished - Aug 2003

Fingerprint

Conducting polymers
conducting polymers
Polymer films
Atomic force microscopy
impedance
Ions
Microsensors
ions
microscopy
Quartz
Steam
scanning
Acetone
Thick films
Water vapor
Ethanol
Vapors
Doping (additives)
amorphous materials
impedance measurement

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Chemical sensing through measurement of thickness/impedance characteristics of ion-conducting polymer films. / Macomber, Clay; Eastman, Michael; Porter, T. L.; Manygoats, K.; Delinger, William G.

In: Journal of the Electrochemical Society, Vol. 150, No. 8, 08.2003.

Research output: Contribution to journalArticle

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