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Analysis of binary gas mixtures using chemiresistors based on carbon nanotubes (CNTs) networked films has been performed for chemical detection up to a sub-ppm level. The effects of individual interfering analytes of reducing H 2 S and NH 3 gases on oxidizing NO 2 gas adsorption in CNTs tangled films are considered. The CNTs are grown by plasma-enhanced chemical vapour deposition technology onto inexpensive alumina substrates, coated by cobalt nanosized catalyst. Charge transfer between adsorbed gas molecules and CNT networks, characterized by a semiconducting p-type electrical transport, occurs depending on opposite trend in the sensor response to the electron-donating interfering gases (H 2 S, NH 3) and target electron-withdrawing NO 2 gas causing a compensation of the charge transport, upon given working conditions. This compensated exchange of electrical charge affects the limit of …
IOP Publishing
Publication date: 
13 Mar 2009

M Penza, R Rossi, M Alvisi, MA Signore, E Serra

Biblio References: 
Volume: 42 Issue: 7 Pages: 072002
Journal of Physics D: Applied Physics