title: Ionic liquid ethanol sensor.
abstract: Ionic liquids containing lithium methylsulfonyl group were prepared from the precursors poly(propylene glycol)-block-(ethylene glycol)-block-(propylene glycol)-bis(2-aminopropyl ether) with different molecular weight. These liquids revealed excellent electrical conductivity in the temperature range -25 to 85 degrees C. Also, they exhibited a high boiling temperature and hence a low vapor pressure in ambient condition. Additionally, they showed a high fluidity with their viscosities being comparative with that of water. To determine the sensitivity of an ethanol sensor by using these ionic liquids, these liquids were subjected into a sequential electrochemical tests with nickel electrodes which performed a high sensitivity for the ethanol sensor. It was found that only the derivative with low molecular weight could detect ethanol. Furthermore, a linear relationship between the response current and the concentration of ethanol was constructed. The detection limit was found to be 0.13% (v/v) and its response time was 336 s.
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC.
authors.forename: Yuan Gee
authors.initials: YG
authors.lastname: Lee
authors.forename: Tse-Chuan
authors.initials: TC
authors.lastname: Chou
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D045424:Complex Mixtures / Q000032:analysis / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D000431:Ethanol / Q000032:analysis* / Q000737:chemistry*; D007477:Ions; D018020:Lithium Compounds / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012996:Solutions; D014159:Transducers
chemical_list: D045424:Complex Mixtures; D004573:Electrolytes; D007477:Ions; D018020:Lithium Compounds; D012996:Solutions; D000431:Ethanol; D009532:Nickel; C028467:lithium hydroxide