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Sensors 2014, 14(4), 6844-6853; doi:10.3390/s140406844

Response Mechanism for Surface Acoustic Wave Gas Sensors Based on Surface-Adsorption

Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
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Author to whom correspondence should be addressed.
Received: 20 February 2014 / Revised: 12 March 2014 / Accepted: 27 March 2014 / Published: 16 April 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

A theoretical model is established to describe the response mechanism of surface acoustic wave (SAW) gas sensors based on physical adsorption on the detector surface. Wohljent’s method is utilized to describe the relationship of sensor output (frequency shift of SAW oscillator) and the mass loaded on the detector surface. The Brunauer-Emmett-Teller (BET) formula and its improved form are introduced to depict the adsorption behavior of gas on the detector surface. By combining the two methods, we obtain a theoretical model for the response mechanism of SAW gas sensors. By using a commercial SAW gas chromatography (GC) analyzer, an experiment is performed to measure the frequency shifts caused by different concentration of dimethyl methylphosphonate (DMMP). The parameters in the model are given by fitting the experimental results and the theoretical curve agrees well with the experimental data. View Full-Text
Keywords: surface acoustic wave (SAW); gas sensor; physical adsorption surface acoustic wave (SAW); gas sensor; physical adsorption
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Liu, J.; Lu, Y. Response Mechanism for Surface Acoustic Wave Gas Sensors Based on Surface-Adsorption. Sensors 2014, 14, 6844-6853.

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