Abstract
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 language | English |
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Pages (from-to) | 931-934 |
Number of pages | 4 |
Journal | Procedia Chemistry |
Volume | 1 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Sept 2009 |
Externally published | Yes |
Event | Eurosensors 23rd Conference - Lausanne, Switzerland Duration: 6 Sept 2009 → 9 Sept 2009 |
Keywords
- Carbon nanotubes
- gas sensors