Metal-loaded polymer films for chemical sensing of ES&H-related pollutants Page: 3 of 74
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Unlimited Release Category UC-606
Printed March 1997
Metal-Loaded Polymer Films for Chemical Sensing
of ES&H-Related Pollutants
Stephen J. Martin and Gregory C. Frye
Microsensor Research and Development Department
Sandia National Laboratories
P.O. Box 5800
Albuquerque, New Mexico 87185-1425
This report summarizes the results of a Laboratory Directed Research and Development (LDRD)
effort to study and model surface acoustic wave (SAW) devices for environmental applications.
The response of polymer-coated SAW devices to temperature changes and polymer vapor
absorption is examined. A perturbational approach is used to relate velocity and attenuation
responses to film translational and strain modes generated by the SAW. Two distinct regimes of
film behavior arise, causing different SAW responses. For glassy films, displacement is nearly
uniform across the film thickness, varying only in the direction of propagation. A model
developed to predict velocity and attenuation in this regime (Model 1), reduces to the familiar
Tiersten (Wohltjen) equation for purely elastic films. For elastomeric (rubbery) films, inertial
effects cause a phase lag to occur across the film for shear displacements. A model to account
for these cross-film displacement gradients (Model 2) predicts a characteristic resonant response
when the film phase shift reaches np/2, where n is an odd integer. These model predictions are
compared with measured responses from polyisobutylene-coated SAW devices as temperature is
varied and during exposure to high vapor concentrations.
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Martin, S.J. & Frye, G.C. Metal-loaded polymer films for chemical sensing of ES&H-related pollutants, report, March 1, 1997; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc675600/m1/3/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.