(228e) Solving the Regeneration Problem for Carbon Nanotube Based Chemical Weapons Detectors
- Conference: AIChE Annual Meeting
- Year: 2005
- Proceeding: 2005 Annual Meeting
- Group: Biomedical Applications of Nanotechnology (Bionanotechnology)
- Time: Tuesday, November 1, 2005 - 1:50pm-2:10pm
We have developed a novel method to remove irreversibly-binding gas molecules from the surface of carbon nanotube gas sensors. Our approach is based upon an analyte-specific surface reaction which decomposes adsorbed analyte molecules. Therefore, it is expected to be applicable not only to carbon nanotube gas sensors but to any type of sorption-based sensors. Extreme reactivity and instability of nerve agents makes our method to be particularly useful for the regeneration of nerve agent detectors. In our work, two kinds of irreversibly-binding nerve agent precursors have been delivered to the dielectrophoretically-deposited nanotube gas sensor array showing a fast response to a small amount of analyte gas followed by a rapid regeneration of the sensor signal. Both electrical transport measurement and Raman spectroscopy are performed to characterize the sensor array and understand the regeneration mechanism.