Highly selective sensors based on Carbon Nanotubes transistors, fabricated using an original dynamic spray technique, for gas electronic fingerprinting.

This contribution deals with Carbon Nanotubes Field Effect transistors (CNTFETs) based gas sensors fabricated using a completely new dynamic air-brush technique (patented) for SWCNTs deposition. The extreme novelty is that our technique is compatible with large surfaces, flexible substrates and allows to fabricate high performances transistors exploiting the percolation effect of the SWCNTs networks achieved with extremely reproducible characteristics. Recently, we have been able to achieve extremely selective measurement of NO
₂
, NH
₃
and CO using four CNTFETS fabricated using different metals as electrodes, exploiting the specific interaction between gas and metal/SWCNT junction. In this way we have identify a sort of electronic fingerprinting of the gas detected. The time response is evaluated at less than 30sec.