Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect
A surface-acoustic-wave (SAW) gas sensor with a low detection limit and fast response for volatile organic compounds (VOCs) based on the condensate-adsorption effect detection is developed. In this sensor a gas chromatography (GC) column acts as the separator element and a dual-resonator oscillator...
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2011-12-01
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Online Access: | http://www.mdpi.com/1424-8220/11/12/11871/ |
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doaj-50fe5ca0c9a240029f524579a0003da92020-11-24T23:51:49ZengMDPI AGSensors1424-82202011-12-011112118711188410.3390/s111211871Advances in SAW Gas Sensors Based on the Condensate-Adsorption EffectMinghua LiuShitang HeShunzhou LiWen WangJiuling LiuA surface-acoustic-wave (SAW) gas sensor with a low detection limit and fast response for volatile organic compounds (VOCs) based on the condensate-adsorption effect detection is developed. In this sensor a gas chromatography (GC) column acts as the separator element and a dual-resonator oscillator acts as the detector element. Regarding the surface effective permittivity method, the response mechanism analysis, which relates the condensate-adsorption effect, is performed, leading to the sensor performance prediction prior to fabrication. New designs of SAW resonators, which act as feedback of the oscillator, are devised in order to decrease the insertion loss and to achieve single-mode control, resulting in superior frequency stability of the oscillator. Based on the new phase modulation approach, excellent short-term frequency stability (±3 Hz/s) is achieved with the SAW oscillator by using the 500 MHz dual-port resonator as feedback element. In a sensor experiment investigating formaldehyde detection, the implemented SAW gas sensor exhibits an excellent threshold detection limit as low as 0.38 pg.http://www.mdpi.com/1424-8220/11/12/11871/gas sensorgas chromatography (GC)surface acoustic wave (SAW)threshold detection limit |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Minghua Liu Shitang He Shunzhou Li Wen Wang Jiuling Liu |
spellingShingle |
Minghua Liu Shitang He Shunzhou Li Wen Wang Jiuling Liu Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect Sensors gas sensor gas chromatography (GC) surface acoustic wave (SAW) threshold detection limit |
author_facet |
Minghua Liu Shitang He Shunzhou Li Wen Wang Jiuling Liu |
author_sort |
Minghua Liu |
title |
Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect |
title_short |
Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect |
title_full |
Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect |
title_fullStr |
Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect |
title_full_unstemmed |
Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect |
title_sort |
advances in saw gas sensors based on the condensate-adsorption effect |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2011-12-01 |
description |
A surface-acoustic-wave (SAW) gas sensor with a low detection limit and fast response for volatile organic compounds (VOCs) based on the condensate-adsorption effect detection is developed. In this sensor a gas chromatography (GC) column acts as the separator element and a dual-resonator oscillator acts as the detector element. Regarding the surface effective permittivity method, the response mechanism analysis, which relates the condensate-adsorption effect, is performed, leading to the sensor performance prediction prior to fabrication. New designs of SAW resonators, which act as feedback of the oscillator, are devised in order to decrease the insertion loss and to achieve single-mode control, resulting in superior frequency stability of the oscillator. Based on the new phase modulation approach, excellent short-term frequency stability (±3 Hz/s) is achieved with the SAW oscillator by using the 500 MHz dual-port resonator as feedback element. In a sensor experiment investigating formaldehyde detection, the implemented SAW gas sensor exhibits an excellent threshold detection limit as low as 0.38 pg. |
topic |
gas sensor gas chromatography (GC) surface acoustic wave (SAW) threshold detection limit |
url |
http://www.mdpi.com/1424-8220/11/12/11871/ |
work_keys_str_mv |
AT minghualiu advancesinsawgassensorsbasedonthecondensateadsorptioneffect AT shitanghe advancesinsawgassensorsbasedonthecondensateadsorptioneffect AT shunzhouli advancesinsawgassensorsbasedonthecondensateadsorptioneffect AT wenwang advancesinsawgassensorsbasedonthecondensateadsorptioneffect AT jiulingliu advancesinsawgassensorsbasedonthecondensateadsorptioneffect |
_version_ |
1725475988466302976 |