| Title: | Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances |
| Author(s): | Aleixandre M; Nakamoto T; |
| Address: | "Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan" |
| ISSN/ISBN: | 1424-8220 (Electronic) 1424-8220 (Linking) |
| Abstract: | "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" |
| Keywords: | electronic nose gas chromatography stationary phase gas sensor polar and non-polar quartz crystal microbalance room temperature ionic liquid; |
| Notes: | "PubMed-not-MEDLINEAleixandre, Manuel Nakamoto, Takamichi eng JP18H03773/Japan Society for the Promotion of Science/ Switzerland 2020/07/24 Sensors (Basel). 2020 Jul 20; 20(14):4026. doi: 10.3390/s20144026" |
