Low-resistance gas sensors fabricated from multiwalled carbon nanotubes coated with a thin tin oxide layer

Liang, Y. X.; Chen, Y. J.; Wang, T. H.
July 2004
Applied Physics Letters;7/26/2004, Vol. 85 Issue 4, p666
Academic Journal
Gas sensors have been fabricated from multiwalled carbon nanotubes (MWNTs) coated with a thin tin oxide layer, and have been used to detect oxidizing and reducing gases down to a ppm level. The barriers between the tin oxide nanocrystal grains on the MWNTs dominate the sensor resistance in different gases, and the conducting carriers in the MWNTs have a low resistance, which make the resistance of the sensors much lower than that of SnO2 nanobelt sensors. The resistance is 130 kΩ in air, 230 kΩ in 2 ppm NO2, and 2.8 MΩ in 50 ppm NO2, so that impedance matching with amplifying circuits can be easily achieved.


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