Abstract
Single-walled carbon nanotube (SWNT) networks were tested as gas sensors for nitrogen dioxide detection. Sensor films were fabricated by airbrushing SWNT dispersions on alumina substrates. Sensors were characterized by resistance measurements from 25 to 200degC. The best response to NO2 was obtained at 200degC. The tested SWNT sensors were sensitive to low NO2 concentrations in nitrogen and air atmospheres. Moreover, these sensors provided no response to interfering gases such as H2, NH3, toluene and octane. The effect of thermal treatments on the sensor response was also investigated.
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