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CNTFET Gas Sensors Using SWCNT Mats: Method for Low-cost Fabrication, Solution to Improve Selectivity, Experimental Results using Interfering Agents

Published online by Cambridge University Press:  31 January 2011

Paolo Bondavalli ,
Louis Gorintin ,
Pierre Legagneux ,
Didier Pribat ,
Laurent Caillier  and
Jean-Pierre Simonato
Paolo Bondavalli
Affiliation:
[email protected]
Louis Gorintin
Affiliation:
[email protected], Thales Research and Technology, 91120, France
Pierre Legagneux
Affiliation:
[email protected], Thales Research and Technology, 91120, France
Didier Pribat
Affiliation:
[email protected], Ecole Polytechnique, 91120, France
Laurent Caillier
Affiliation:
[email protected], CEA LITEN, 38000, France
Jean-Pierre Simonato
Affiliation:
[email protected], CEA LITEN, 38000, France
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Abstract

The first paper showing the great potentiality of Carbon Nanotubes Field Effect transistors (CNTFETs) for gas sensing applications was published in 2000 [1]. It has been demonstrated that the performances of this kind of sensors are extremely interesting: a sensitivity of around 100ppt (e.g. for NO2 [2]) has been achieved in 2003 and several techniques to improve selectivity have been tested with very promising results [2]. The main issues that have not allowed, up to now, these devices to strike more largely the market of sensors, have been the lack of an industrial method to obtain low-cost devices, a demonstration of their selectivity in relevant environments and finally a deeper study on the effect of humidity and the possible solutions to reduce it. This contribution deals with CNTFETs based sensors fabricated using air-brush technique deposition on large surfaces. Compared to our last contribution [3], we have optimized the air-brush technique in order to obtain high performances transistors (Log(Ion)/Log(Ioff) ∼ 5/6) with highly reproducible characteristics : this is a key point for the industrial exploitation. We have developed a machine which allows us the dynamic deposition on heated substrates of the SWCNT solutions, improving dramatically the uniformity of the SWCNT mats. We have performed tests using different solvents that could be adapted as a function of the substrates (e.g. flexible substrates). Moreover these transistors have been achieved using different metal electrodes (patented approach [4]) in order to improve selectivity. Results of tests using NO2, NH3 with concentrations between ∼ 1ppm and 10ppm will be shown during the meeting.

Keywords

sensorelectronic materialnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1204: Symposium K – Nanotubes and Related Nanostructures-2009 , 2009 , 1204-K07-04
Copyright
Copyright © Materials Research Society 2010

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