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Sensors For Sub-ppm NO2 Gas Detection Based On Carbon Nanotube Thin Films

L. Valentini, I. Armentano, J. Kenny, C. Cantalini, L. Lozzi, S. Santucci
Published 2003 · Physics

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Carbon nanotubes (CNTs) deposited by plasma-enhanced chemical vapor deposition on Si3N4/Si substrates have been investigated as resistive gas sensors for NO2. Upon exposure to NO2, the electrical resistance of the CNTs was found to decrease. The maximum variation of resistance to NO2 was found at an operating temperature of around 165 °C. The sensor exhibited high sensitivity to NO2 gas at concentrations as low as 10 ppb, fast response time, and good selectivity. A thermal treatment method, based on repeated heating and cooling of the films, adjusted the resistance of the sensor film and optimized the sensor response to NO2.
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