NO2 and CO interaction with plasma treated Au-decorated MWCNTs: Detection pathways

R. Leghrib, E. Llobet, A. Felten, J. J. Pireaux, Z. Zanolli, J. C. Charlier, I. Suárez, C. Ewels

    Research output: Contribution to journalArticlepeer-review


    The detection mechanisms of gas sensors based on oxygen plasma functionalised multi wall carbon nanotubes (MWCNTs) and rf plasma-treated nanotubes decorated with gold nanoclusters are experimentally and theoretically investigated. Results from X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) analysis are discussed. It is found that NO2 detection involves the interaction with oxygenated vacancies and/ or Au nanoclusters present on the nanotube walls, while CO detection is significantly enhanced by the interaction with Au nanoclusters anchored at the nanotube sidewalls. These differences in detection pathways open the possibility for fabricating selective MWCNT sensors.

    Original languageEnglish
    Pages (from-to)931-934
    Number of pages4
    JournalProcedia Chemistry
    Issue number1
    Publication statusPublished - 1 Sept 2009


    • Carbon nanotubes
    • gas sensors


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