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Controlling the Cross-Sensitivity of Carbon Nanotube-Based Gas Sensors to Water Using Zeolites

Evans, GP; Buckley, DJ; Adedigba, A-L; Sankar, G; Skipper, NT; Parkin, IP; (2016) Controlling the Cross-Sensitivity of Carbon Nanotube-Based Gas Sensors to Water Using Zeolites. ACS Applied Materials and Interfaces , 8 (41) pp. 28096-28104. 10.1021/acsami.6b10042. Green open access

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Abstract

Carbon nanotube-based 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.

Type: Article
Title: Controlling the Cross-Sensitivity of Carbon Nanotube-Based Gas Sensors to Water Using Zeolites
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acsami.6b10042
Publisher version: http://dx.doi.org/10.1021/acsami.6b10042
Language: English
Additional information: This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Materials and Interfaces , copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acsami.6b10042
Keywords: Science & Technology, Technology, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Science & Technology - Other Topics, Materials Science, Single-Walled Carbon Nanotubes, Nanotube Network, Gas Sensor, Zeolite, Molecular Sieve, Environmental Monitoring Humidity, Nitrogen Dioxide, Sensing Mechanism, Chemical Sensors, Vapor Sensors, Thin-Films, Na-Y, No2, Adsorption, Nanomaterials, Composites, Humidity
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1528317
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