Journal
BIOSENSORS & BIOELECTRONICS
Volume 20, Issue 1, Pages 33-40Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2004.01.026
Keywords
cyclic voltammetry; redox; sensitivity; detection limit; response time
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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 degreesC. 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. (C) 2004 Elsevier B.V. All rights reserved.
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