S. Ippolito, K. Kalantar-zadeh, W. Wlodarski, K. Galatsis, W. Fischer, O. Berger, H. Stab
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引用次数: 5
Abstract
A multi-layered surface acoustic wave (SAW) transducers have been employed for nitrogen dioxide gas sensing applications. The structure composes of a SiO/sub 2/ guiding layer deposited on a 90/spl deg/ rotated ST-cut quartz crystal substrate with a thin film of copper phthalocyanine acting as the selective layer. The dominant mode of acoustic propagation in the sensor is a combination of mainly a shear and a longitudinal displacement types. Such a structure has the advantage of confining the acoustic wave energy to the surface of the device, which increases the sensitivity of the system.
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