Multiple-frequency SAW devices for chemical sensing and materials characterization
The authors have demonstrated the use of multiple-frequency surface acoustic wave (SAW) devices for chemical detection and characterization of thin film properties. A seven-frequencies SAW device was designed and fabricated with nominal Rayleigh wave center frequencies ranging from 25 to 200 MHz in {radical}2 multiples. For this device, transducer periodicity, finger length, and center-to-center transducer separation all scale with the reciprocal of the center frequency. Coating this device with a thin polymer film allows the study of frequency-dependent changes in the viscoelastic properties of the polymer as a function of temperature and of the concentration of various organic solvents, which in turn provides a means for selectively detecting these compounds. Multifrequency devices provide a means to distinguish the many perturbations affecting SAW propagation from one another. 8 refs., 9 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5939746
- Report Number(s):
- SAND-91-0063C; CONF-9106116--3; ON: DE91010856
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ACOUSTIC TESTING
BUTADIENE
DATA
DIENES
ELASTICITY
EXPERIMENTAL DATA
FILMS
HYDROCARBONS
INFORMATION
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OSCILLATIONS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYENES
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
SOUND WAVES
SYNTHETIC MATERIALS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
TESTING
VISCOSITY