Figure 4.

Electrical resistance changes at 80°C with 10 ppm of NH3. 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.

Dong et al. Nanoscale Research Letters 2013 8:12   doi:10.1186/1556-276X-8-12
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