2008 Annual Meeting
(594c) Stability of Oxime Based Microsensor for Organo-Phosphate Vapor Detection
Authors
The purpose of this research was to develop a liquid medium in which the oxime would remain stable, while still being able to function as intented in the microsensor. Solutions in pure organic solvents do not show any noticable degradation, however, the reaction between oxime and organo-phosphate requires hydroxide ions in order to take place [3]. As a result, pure organic solvents will not be compatible with the microsensor electrochemistry. To solve both problems, a concentrated organic oxime solution was combined with the basic aqueous buffer just prior to being used in the detection process. Microsensor performance using these solution pre-mixed had no appreciable difference from the original aqueous oxime solution. Additionally, a small serpentine channel component was fabricated with the same dimensions and material as the original microsensor. This allowed for the mixing of the two solutions within the device. Studies show that the sensor response utilizing the integrated micromixer was nearly identical to the response when the solutions were premixed and fed at the same rate.
REFERENCES:
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[4] I. Oh, and R. Masel, Electrochem. Solid-State Lett., 10, J19 J22 (2007).