Nanotech 2011

Carbon nanotubes transistors based Selective Gas sensors : from laboratory to mass production

L. Gorintin
Thales Research and technology, FR

Keywords: gas sensor, spray, Large scale, selectivity, warfare gas sensing

Abstract:

Gas sensing Property of Carbon NanoTube (CNT) transistors are known for several years to be extremely sensitive to gases and thus have been proposed as gas sensors for several applications. But their versatility and their large-scale production is still a problem. In this article, we present how we realize reproducible devices with an airbrush technique. With this technique, the density of the CNT network can be adjusted precisely. In consequence we are able to achieve transistors with on/off ratio of more than 5 orders of magnitude and lower the detection limit of these sensor under the ppm for a large range of gases. Futhermore to perform selectivity, we have develop a new technology patented based on CNTFET based arrays with different metals as electrodes. We demonstrate that each gas interacts specifically with each metal identifying a sort of electronic fingerprinting which enable to discriminate each gas of one other. We will show in our presentation selective detection of NO2, NH3, SO2 and CO and DMMP (sarin stimulant).
 

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