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Enhancement of sensitivity in gas chemiresistors based on carbon nanotube surface functionalized with noble metal (Au, Pt) nanoclusters

TitleEnhancement of sensitivity in gas chemiresistors based on carbon nanotube surface functionalized with noble metal (Au, Pt) nanoclusters
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2007
AuthorsPenza, Michele, Cassano Gennaro, Rossi R., Alvisi Marco, Rizzo Antonella, Signore M.A., Dikonimos Th., Serra Emanuele, and Giorgi R.
JournalApplied Physics Letters
Volume90
ISSN00036951
KeywordsAlumina, Ammonia, Catalyst activity, Chemical sensors, Chemiresistors, Gold, Multiwalled carbon nanotube films, Multiwalled carbon nanotubes (MWCN), Nanoclusters, Nitrogen oxides, Plasma enhanced chemical vapor deposition, Surface catalysts
Abstract

Multiwalled carbon nanotube (MWCNT) films have been fabricated by using plasma-enhanced chemical vapor deposition system onto Cr-Au patterned alumina substrates, provided with 3 nm thick Fe growth catalyst, for N O2 and N H3 gas sensing applications, at sensor temperature in the range of 100-250 °C. Nanoclusters of noble metal surface catalysts (Au and Pt) have been sputtered on the surface of MWCNTs to enhance the gas sensitivity with respect to unfunctionalized carbon nanotube films. It was found that the gas sensitivity of Pt- and Au-functionalized MWCNT gas sensors significantly improved by a factor up to an order of magnitude through a spillover effect for N H3 and N O2 gas detections, respectively. The metal-functionalized MWCNT sensors exhibit very high gas sensitivity, fast response, reversibility, good repeatability, and sub-ppm range detection limit with the sensing properties of the MWCNT films tailored by surface catalyst used to functionalize the MWCNT sensors. © 2007 American Institute of Physics.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-34248586334&doi=10.1063%2f1.2722207&partnerID=40&md5=256bb9ffab07efe4115f54f58ee70ece
DOI10.1063/1.2722207
Citation KeyPenza2007