Figure 4From: Detection of a CO and NH3 gas mixture using carboxylic acid-functionalized single-walled carbon nanotubesElectrical resistance changes at 80°C with 10 ppm of NH 3 . Electrical resistance changes of the sensor as a function of time for five cycles at 80°C with 10 ppm of NH3. Detection of a CO and NH3 gas mixture using carboxylic acid-functionalized single-walled carbon nanotubes.Back to article page