Abstract
The fundamental properties of a gas-sensitive device for the recognition of odoriferous gases made of a surface acoustic wave (SAW) device and Langmuir-Blodgett (LB) film were studied. An SAW device can be operated at a higher oscillation frequency than a quartz oscillator, and an organic ultrathin film, such as the LB film, was used as the gas-sensitive film on the SAW device. The relationship between gassensitivity and the molecular orientation, as well as the thickness and the counterion of LB film, was investigated. The molecular orientation and the thickness of the LB films affected the gassensitivity. The gassensitivity of LB films incorporating counterions was largely dependent on the electronegativity of the counterion. The characteristics of the gas-sensitive device were elucidated and were utilized to realize the recognition system for odoriferous gases.
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