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Sensors 2009, 9(2), 980-994; doi:10.3390/s90200980

Surface Acoustic WaveAmmonia Sensors Based on ST-cut Quartz under Periodic Al Structure

Department of Electrical Engineering, I- Shou University, Kaohsiung County, 84001, Taiwan
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Author to whom correspondence should be addressed.
Received: 16 January 2009 / Accepted: 13 February 2009 / Published: 16 February 2009
(This article belongs to the Section Chemical Sensors)
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Abstract

Surface acoustic wave (SAW) devices are key components for sensing applications. SAW propagation under a periodic grating was investigated in this work. The theoretical method used here is the space harmonic method. We also applied the results of SAW propagation studied in this work to design a two-port resonator with an Al grating on ST-cut quartz. The measured frequency responses of the resonator were similar to the simulation ones. Then, the chemical interface of polyaniline/WO3 composites was coated on the SAW sensor for ammonia detection. The SAW sensor responded to ammonia gas and could be regenerated using dry nitrogen. View Full-Text
Keywords: Rayleigh SAW; space harmonic method; ammonia; polyaniline/WO3 Rayleigh SAW; space harmonic method; ammonia; polyaniline/WO3
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hsu, C.-L.; Shen, C.-Y.; Tsai, R.-T.; Su, M.-Y. Surface Acoustic WaveAmmonia Sensors Based on ST-cut Quartz under Periodic Al Structure. Sensors 2009, 9, 980-994.

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