Modification of the surface electronic properties of vertically aligned and randomly distributed carbon nanotubes and the hydrophobic character after exposure to Ar:F 2 and CF 4 plasma are exploited to optimize the sensing characteristics of these materials. The sensing properties of fluorinated carbon nanotubes are disclosed by probing their stability and responsiveness towards the detection of two selected pollutants such as nitrogen dioxide and ammonia (NO 2 and NH 3). The effects of both humidity level and geometry of the sensing layer are assessed. It is demonstrated that fluorination, by increasing the surface hydrophobicity, results in increased response reproducibility and enhanced sensor response towards NH 3 when using vertically aligned carbon nanotubes.
- Fluorinated carbon nanotubes
- Increased response reproducibility under humid conditions
- Room temperature gas sensors
- Sensing response to NO and NH