Highly selective N O2 gas sensors made of MWCNTs and W O3 hybrid layers

E. H. Espinosa, R. Ionescu, E. Llobet, A. Felten, C. Bittencourt, E. Sotter, Z. Topalian, P. Heszler, C. G. Granqvist, J. J. Pireaux, X. Correig

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15 Citations (Scopus)


Hybrid gas sensors were fabricated by means of multiwalled carbon nanotubes (MWCNTs) covered by W O3 deposited by an advanced reactive gas deposition method. In order to increase the dispersion of nanotubes and attach functional groups to their surface so as to enhance their compatibility with other compounds, the MWCNTs were functionalized in two different radio-frequency plasmas (oxygen or hydrogen) under different operating conditions. X-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy were employed to analyze the composition and morphology of the hybrid films. Gas sensors based on such films were found to be very selective to N O2 when operated at room temperature. No cross-sensitivity was found to other hazardous gases such as N H3 or CO.

Original languageEnglish
Pages (from-to)J141-J149
JournalJournal of the Electrochemical Society
Issue number5
Publication statusPublished - Apr 10 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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    Espinosa, E. H., Ionescu, R., Llobet, E., Felten, A., Bittencourt, C., Sotter, E., Topalian, Z., Heszler, P., Granqvist, C. G., Pireaux, J. J., & Correig, X. (2007). Highly selective N O2 gas sensors made of MWCNTs and W O3 hybrid layers. Journal of the Electrochemical Society, 154(5), J141-J149. https://doi.org/10.1149/1.2667855