Gas sensors based on doped-CNT/SnO2 composites for NO2 detection at room temperature |
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Authors: | R LeghribA Felten JJ PireauxE Llobet |
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Affiliation: | a MINOS, EMaS, University Rovira i Virgili, Avda. Països Catalans, 26, 43007 Tarragona, Spainb University of Namur, LISE, 61 rue de Bruxelles, Namur 5000, Namur, Belgium |
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Abstract: | For the first time nitrogen or boron doped carbon nanotubes were added into a SnO2 matrix to develop a new hybrid CNTs/SnO2 gas sensors. The hybrid sensor is utilised to detect low ppb concentrations of NO2 in air, by measuring resistance changes of thin CNTs/SnO2 films. The tests are performed at room temperature. For comparison, pure SnO2 and N or B-substituted CNT sensors are also examined. Comparative gas sensing results reveal that the CNTs/SnO2 hybrid sensors exhibit much higher response towards NO2, at least by a factor of 10, and good baseline recovery properties at room temperature than the blank SnO2 and the N or B-substituted CNT sensors. This finding shows that doping SnO2 with low quantity of CNTs doped with heteroatoms can dramatically improve sensitivity. |
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Keywords: | Gas sensors N- or B-doped carbon nanotubes Metal oxides NO2 detection |
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