Molecular host sol-gel films for chemical sensing applications

Conference · Tue Dec 30 23:00:00 EST 1997

OSTI ID:559946

Shi, J; Johnson, S; Yang, X; Swanson, B ^[1]

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1. Los Alamos National Lab., NM (United States)

Sol-gel cyclodextrin coatings on surface acoustic wave (SAW) device as VOC sensors have been studied. The sol-gel approach to thin films efficiently yields uniform coatings on SAW devices. The films were characterized by ATR-FT-IR, ellipsometry and SEM. The incorporation of molecular host reagents (cyclodextins and their derivatives) into thin films greatly enhance the sensitivity and selectivity of SAW sensors. It is believed that molecular recognition (selective sorption) occurs at the gas-solid interface. From the SAW data, it is possible to calculate the binding constants of sol-gel films towards a variety VOCs. The identification of VOCs based on SAW sensor arrays is discussed.

• OSTI ID: 559946
• Report Number(s): CONF-970443--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
CARBON DIOXIDE
COATINGS
DEXTRIN
ELLIPSOMETRY
MEASURING INSTRUMENTS
REAGENTS
SORPTION
THIN FILMS