Abstract
A technique for obtaining gas sensor samples from graphite paper with a nanotube film is described. Current-induced annealing of the graphite paper and additional evaporation of a nanotube graphite film in a hydrogen atmosphere are combined in the developed technique. The current−voltage characteristics of the samples have been measured at room temperature in air, in vacuum, and at low concentrations of NH3, ethanol, and acetone. Experiments demonstrate that these samples containing carbon multiwall nanotubes can be used as a gas sensor to detect the presence of NH3 and acetone. They are characterized by high sensitivity and selectivity, fast response, restoration, and stability of the characteristics. The estimated sensor sensitivities to NH3, acetone, and ethanol at a current of 96.8 mA are ~15, ~12, and ~1 mV/Torr, respectively. Their sensitivity is determined by the difference in the behavior of their current−voltage characteristics under exposure to NH3, ethanol, and acetone. The sensor features fast response (5–20 s) and restoration (within 5 min, restoration to the initial state before the exposure to NH3 is 100.2%), as well as the stability of its characteristics (the pressure ranges from 1 × 10–6 to 760 Torr).
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Original Russian Text © S.V. Antonenko, 2016, published in Pribory i Tekhnika Eksperimenta, 2016, No. 2, pp. 117–120.
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Antonenko, S.V. A gas sensor made from a graphite paper with a nanotube film. Instrum Exp Tech 59, 278–281 (2016). https://doi.org/10.1134/S0020441216010188
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DOI: https://doi.org/10.1134/S0020441216010188