scholarly journals Room Temperature Ionic Liquids As Useful Overlayers for Estimating Food Quality from Their Odor Analysis by Quartz Crystal Microbalance Measurements

2013 ◽  
Vol 85 (15) ◽  
pp. 7241-7247 ◽  
Author(s):  
Rosanna Toniolo ◽  
Andrea Pizzariello ◽  
Nicolò Dossi ◽  
Stefano Lorenzon ◽  
Ornella Abollino ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Quartz Crystal Microbalance ◽  
Food Quality ◽  
Room Temperature ◽  
Quartz Crystal ◽  
Room Temperature Ionic Liquids ◽  
Odor Analysis

scholarly journals Study of Room Temperature Ionic Liquids as Gas Sensing Materials in Quartz Crystal Microbalances

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 4026
Author(s):  
Manuel Aleixandre ◽  
Takamichi Nakamoto
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Quartz Crystal ◽  
Gas Sensing ◽  
Stationary Phases ◽  
Room Temperature Ionic Liquids ◽  
Discrimination Power ◽  
Resonant Frequency Shift ◽  
Wilks Lambda ◽  
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 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.

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