The improved ammonia gas sensors constructed by l-glutamic acid hydrochloride on surface acoustic wave devices

The gas sensing properties of l-glutamic acid hydrochloride deposited onto 128° YX-LiNbO 3 surface acoustic wave (SAW) delay line are monitored in this study. The sensitivity, response time, reversibility, repeatability, selectivity, and long-term stability of l-glutamic acid hydrochloride are also...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2002-05, Vol.84 (2), p.231-236
Main Authors: Shen, Chi-Yen, Huang, Chun-Pu, Chuo, Hsu-Chi
Format: Article
Language:English
Subjects:
Ammonia
Repeatability
Reversibility
Sensitivity
Stability
Surface acoustic wave
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Summary:The gas sensing properties of l-glutamic acid hydrochloride deposited onto 128° YX-LiNbO 3 surface acoustic wave (SAW) delay line are monitored in this study. The sensitivity, response time, reversibility, repeatability, selectivity, and long-term stability of l-glutamic acid hydrochloride are also investigated. The SAW gas sensors based on l-glutamic acid hydrochloride exhibit good sensitivity and reversibility towards ammonia gas, and the results are highly repeatable. The detection limit of l-glutamic acid hydrochloride has been found to be less than 0.90 ppm ammonia in air. l-Glutamic acid hydrochloride has been observed to have an excellent transient response. Moreover, the selectivity of l-glutamic acid hydrochloride to ammonia is good. The long-term stability of l-glutamic acid hydrochloride is also stable. The response degrades at a rate of 0.01 ppm per day.
ISSN:0925-4005
1873-3077
DOI:10.1016/S0925-4005(02)00030-8