| Paper Abstract and Keywords |
| Presentation |
PSE-Coated Interdigital Resonator for Selective Detection of Ammonia Gas Sensor
Warunee Krudpun, Nonchanutt Chudpooti (KMUTNB), Panida Lorwongthagool, Somporn Seewattanapon (RUS), Prayoot Akkaraekthalin (KMUTNB) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
This paper presents, for the first time, a microwave gas sensor utilizing Poly (styrene-co-maleic acid) partial isobutyl/methyl mixed ester (PSE) coated on an interdigital resonator. This coated film was investigated for its sensing behavior toward gases in a volatile organic compound, e.g. ammonia, acetone, ethanol and methanol. The PSE is the dielectric material sensed to gas density. Conventionally, the PSE is used in DC gas sensor [1]. To sense the gas, it was employed as solvent mixed with a conductor dust such as carbon or any conductive powder for conductive property. So, it can detect gas variation by the change of resistivity in its sensor. The sensor was designed based on a DiClad 880 substrate with an interdigital resonator, operating at 4 GHz, on the middle of an ungrounded coplanar waveguide transmission line structure with rejection characteristic by coating the PSE solution as a sensed-gas material. The transmission coefficient, S21, was changed depending on the dielectric properties of the PSE change due to various concentrations of gas targeted in a range of 50 to 1000 ppm (50 ppm, 200 ppm, 500 ppm, 1000 ppm) under a static system in a closed chamber at room temperature. The extracted results of differential transmission coefficient change, S21, from four samples of ammonia concentration can be separated impressively. To confirm the selectivity performance of ammonia gas, three interference gases, e.g. acetone, ethanol and methanol, were investigated. The measured results show that the proposed sensor can discriminate ammonia gas from three interference gases over the entire concentration range in only three minutes. Moreover, comparing with conventional sensing material in microwave regime (PEDOT:PSS and carbon nanotube) [2], our sensor with PSE coating is it has many advantages, such as low cost, low profile in preparation, chemical stability and less effect with water as ambient humidity increases. The PSE-coated sensor in this paper is suitable for a high-performance selectivity in ammonia gas sensing applications in industrial processes and agricultural products. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
Poly (styrene-co-maleic acid) partial isobutyl/methyl mixed ester / PS / microwave gas sensor / PSE-coated / interdigital resonator / ammonia gas sensor / / |
| Reference Info. |
IEICE Tech. Rep. |
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