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Humidity and Temperature Effects on Carbon Nanotube Field-Effect Transistor-Based Gas Sensors

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Carbon nanotube based field effect transistors are used for detection of NH3 and NO2. The detection mechanism is attributed to the modulation in Schottky barrier height at the metal-carbon nanotube interface by the gas molecules. We find that an increase in humidity weakens the gate control and decreases the sensitivities to NH3 and NO2. In addition, the sensitivity diminishes significantly when temperature increases from room temperature to 150 °C.
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Document Type: Research Article

Publication date: December 1, 2008

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