Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances
Twenty-eight quartz crystal microbalance (QCM) sensors coated with different sensing films were tested and analyzed in this work; twenty-three sensors were coated in different room temperature ionic liquids (RTILs) and five additional QCM sensors were coated with conventional films commonly used as...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-07-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/14/4026 |
| _version_ | 1797561892485464064 |
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| author | Manuel Aleixandre Takamichi Nakamoto |
| author_facet | Manuel Aleixandre Takamichi Nakamoto |
| author_sort | Manuel Aleixandre |
| collection | DOAJ |
| description | Twenty-eight quartz crystal microbalance (QCM) sensors coated with different sensing films were tested and analyzed in this work; twenty-three sensors were coated in different room temperature ionic liquids (RTILs) and five additional QCM sensors were coated with conventional films commonly used as stationary phases in gas chromatography. Four volatile organic compounds (VOCs), in gaseous phase—hexanol, butyl acetate, 2-hexanone, and hexanoic acid—were measured. Two transducer mechanisms were used; resonant frequency shift and resistance shift of a QCM Mason equivalent circuit. The sensors were characterized by their sensitivity to the VOCs and their discrimination power of the four VOCs. The highest separation among VOCs was obtained when frequency and resistance information of both RTIL and conventional films was used, a sensor array composed by two RTILs (1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide and 1-hexyl-3-methylimidazolium hexafluorophosphate) and two conventional films (tricresyl phosphate and apiezon-L) was found to improve the Wilks lambda separation for the tested gases two orders of magnitude compared to the Wilks lambda using only a conventional films array. |
| first_indexed | 2024-03-10T18:21:02Z |
| format | Article |
| id | doaj.art-a30bdcbbb03b4cbf8619e11d83a29772 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T18:21:02Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-a30bdcbbb03b4cbf8619e11d83a297722023-11-20T07:21:26ZengMDPI AGSensors1424-82202020-07-012014402610.3390/s20144026Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal MicrobalancesManuel Aleixandre0Takamichi Nakamoto1Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, JapanInstitute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, JapanTwenty-eight quartz crystal microbalance (QCM) sensors coated with different sensing films were tested and analyzed in this work; twenty-three sensors were coated in different room temperature ionic liquids (RTILs) and five additional QCM sensors were coated with conventional films commonly used as stationary phases in gas chromatography. Four volatile organic compounds (VOCs), in gaseous phase—hexanol, butyl acetate, 2-hexanone, and hexanoic acid—were measured. Two transducer mechanisms were used; resonant frequency shift and resistance shift of a QCM Mason equivalent circuit. The sensors were characterized by their sensitivity to the VOCs and their discrimination power of the four VOCs. The highest separation among VOCs was obtained when frequency and resistance information of both RTIL and conventional films was used, a sensor array composed by two RTILs (1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide and 1-hexyl-3-methylimidazolium hexafluorophosphate) and two conventional films (tricresyl phosphate and apiezon-L) was found to improve the Wilks lambda separation for the tested gases two orders of magnitude compared to the Wilks lambda using only a conventional films array.https://www.mdpi.com/1424-8220/20/14/4026gas sensorroom temperature ionic liquidpolar and non-polargas chromatography stationary phaseelectronic nosequartz crystal microbalance |
| spellingShingle | Manuel Aleixandre Takamichi Nakamoto Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances Sensors gas sensor room temperature ionic liquid polar and non-polar gas chromatography stationary phase electronic nose quartz crystal microbalance |
| title | Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances |
| title_full | Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances |
| title_fullStr | Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances |
| title_full_unstemmed | Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances |
| title_short | Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances |
| title_sort | study of room temperature ionic liquids as gas sensing materials in quartz crystal microbalances |
| topic | gas sensor room temperature ionic liquid polar and non-polar gas chromatography stationary phase electronic nose quartz crystal microbalance |
| url | https://www.mdpi.com/1424-8220/20/14/4026 |
| work_keys_str_mv | AT manuelaleixandre studyofroomtemperatureionicliquidsasgassensingmaterialsinquartzcrystalmicrobalances AT takamichinakamoto studyofroomtemperatureionicliquidsasgassensingmaterialsinquartzcrystalmicrobalances |