Effect of thickness of carbon nanotube films on enhancement of sensor response

[Display omitted] •Criterion of the thickness for sensor responsivity of CNT based gas sensor.•Effective thickness for gas adsorption is employed and that meets detection model previously proposed.•Only the order of 7 μm thickness can be used effectively. Molecular adsorption on carbon nanotube (CNT...

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Bibliographic Details
Published in:Chemical physics letters 2019-11, Vol.734, p.136730, Article 136730
Main Authors: Inoue, Shuhei, Tomita, Yoshihiro, Matsumura, Yukihiko
Format: Article
Language:English
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Summary:[Display omitted] •Criterion of the thickness for sensor responsivity of CNT based gas sensor.•Effective thickness for gas adsorption is employed and that meets detection model previously proposed.•Only the order of 7 μm thickness can be used effectively. Molecular adsorption on carbon nanotube (CNT) films follows the Langmuir adsorption isotherm even for polar molecules at low gas pressures. Therefore, this film can be applied to gas sensors. In order to clarify the effect of thickness on sensor response, we fabricated CNT films of different thicknesses and observed their behavior. Because the adsorption is expected to occur near the surface, we determined the effective penetration thickness for the gas molecules and identified an approximate thickness of 7 μm.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2019.136730