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Proceedings Paper

High performances CNTFETs achieved using CNT networks for selective gas sensing
Author(s): Louis Gorintin; Paolo Bondavalli; Pierre Legagneux; Didier Pribat
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Paper Abstract

Our study deals with the utilization of carbon nanotubes networks based transistors with different metal electrodes for highly selective gas sensing. Indeed, carbon nanotubes networks can be used as semi conducting materials to achieve good performances transistors. These devices are extremely sensitive to the change of the Schottky barrier heights between Single Wall Carbon Nanotubes (SWCNTs) and drain/source metal electrodes: the gas adsorption creates an interfacial dipole that modifies the metal work function and so the bending and the height of the Schottky barrier at the contacts. Moreover each gas interacts specifically with each metal identifying a sort of electronic fingerprinting. Using airbrush technique for deposition, we have been able to achieve uniform random networks of carbon nanotubes suitable for large area applications and mass production such as fabrication of CNT based gas sensors. These networks enable us to achieve transistors with on/off ratio of more than 5 orders of magnitude. To reach these characteristics, the density of the CNT network has been adjusted in order to reach the percolation threshold only for semi-conducting nanotubes. These optimized devices have allowed us to tune the sensitivity (improving it) of our sensors for highly selective detection of DiMethyl-Methyl-Phosphonate (DMMP, a sarin stimulant), and even volatile drug precursors using Pd, Au and Mo electrodes.

Paper Details

Date Published: 18 August 2009
PDF: 10 pages
Proc. SPIE 7399, Carbon Nanotubes, Graphene, and Associated Devices II, 739909 (18 August 2009); doi: 10.1117/12.826156
Show Author Affiliations
Louis Gorintin, Thales Research & Technology (France)
Paolo Bondavalli, Thales Research & Technology (France)
Pierre Legagneux, Thales Research & Technology (France)
Didier Pribat, LPICM, Ecole Polytechnique (France)

Published in SPIE Proceedings Vol. 7399:
Carbon Nanotubes, Graphene, and Associated Devices II
Manijeh Razeghi; Didier Pribat; Young-Hee Lee, Editor(s)

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