Type:
Book
Description:
Carbon nanotubes (CNTs) networked films have been fabricated by plasma-enhanced chemical vapor deposition system onto alumina substrates, provided with 6 nm thick Co growth-catalyst, for NO2, H2S and NH3 gas sensing applications, at sensor temperature in the range of 100-250°C. Nanoclusters of noble metals surface-catalysts of Au, Pt and Pd have been sputtered on the surface of CNTs to enhance the gas sensitivity. It was demonstrated that the gas sensitivity of the metal-functionalized CNTs gas sensors significantly improved by a factor up to an order of magnitude through a spillover effect. The gas sensing properties of the CNTs-sensors, including the metal functionalized CNTs, are characterized by a change of the electrical conductivity in a model of the charge transfer with a semiconducting -type character. The metal-functionalized CNTs sensors exhibit high gas sensitivity, fast response …
Publisher:
Publication date:
1 Jan 2009
Biblio References:
Pages: 130-136
Origin:
Sensors And Microsystems