Vertically-aligned carbon nanotubes (CNTs) films have been grown by radiofrequency plasma-enhanced chemical vapor deposition system onto alumina substrates, coated with 2.5 nm thick Fe catalyst, for NO2, H 2 and C2H5OH gas sensing applications, at sensor temperatures from room-temperature to 150°C. The CNTs appear in the form of forest-like structure. Nanoclusters of noble metals with nominal thickness of 5 nm of Pt, Ru and Ag have been sputtered on the top-surface of the vertically-aligned CNTs layers to enhance the gas sensitivity. It was demonstrated that the gas sensitivity of the metal modified CNTs-sensors significantly improved by a factor up to an order of magnitude through a spillover effect, and a broader selectivity was provided. The gas sensing properties of the CNTs-sensors, including the metal-modified CNTs, are characterized by a change of the electrical conductivity in a model of the charge transfer with a semiconducting p-type character. The metal-functionalized CNTs-sensors exhibit high sensitivity, fast response, reversibility, good repeatability, sub-ppm range detection limit. A practical application of the CNTs-sensors for monitoring landfill gas is presented. © 2010 Springer Science+Business Media B.V.
CITATION STYLE
Penza, M., Rossi, R., Alvisi, M., Signore, M. A., Cassano, G., Pentassuglia, R., … Serra, E. (2010). Metal-functionalized and vertically-aligned multiwalled carbon nanotube layers for low temperature gas sensing applications. In Lecture Notes in Electrical Engineering (Vol. 54 LNEE, pp. 185–191). https://doi.org/10.1007/978-90-481-3606-3_35
Mendeley helps you to discover research relevant for your work.