Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 41, Pages 28096-28104Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10042
Keywords
single-walled carbon nanotubes; nanotube network; gas sensor; zeolite; molecular sieve; environmental monitoring humidity; nitrogen dioxide
Funding
- EPSRC Grant as part of UCL's Security Science Doctoral Training Centre [EP/G037264/1]
- Engineering and Physical Sciences Research Council [1207381] Funding Source: researchfish
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Carbon nanotubeliased gas sensors can be used to detect harmful environmental pollutants such as NO2 at room temperature. Although they show promise as low powered, sensitive, and affordable monitoring devices, cross sensitivity of functionalized carbon nanotubes to water vapor often obscures the detection of target molecules. This is a barrier to adoption for monitoring of airborne pollutants because of the varying humidity levels found in real world environments. Zeolites, also known as molecular sieves because of their selective adsorption properties, are used in this work to control the cross-sensitivity of single-walled carbon nanotube (SWCNT)-based sensors to water vapor. Zeolites incorporated into the sensing layer are found to reduce interference effects that would otherwise obscure the identification of NO2 gas, permitting repeatable detection over a range of relative humidities. This significant improvement is found to depend on the arrangement of the SWCNT-zeolite layers in the sensing device, as well as the hydrophilicity of the chosen zeolite.
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