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Merck

Ionic liquid ethanol sensor.

Biosensors & bioelectronics (2004-05-15)
Yuan Gee Lee, Tse-Chuan Chou
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lithium hydroxide, powder, reagent grade, ≥98%
Sigma-Aldrich
Lithium hydroxide, reagent grade, 98%
Sigma-Aldrich
Lithium hydroxide monohydrate, 99.95% trace metals basis
Sigma-Aldrich
Lithium hydroxide monohydrate, BioUltra, ≥99.0% (T)
Sigma-Aldrich
Lithium hydroxide monohydrate, BioXtra, 98.5-101.5% (titration)
Sigma-Aldrich
Lithium hydroxide monohydrate, ACS reagent, ≥98.0%