Hernandez, PT;
Hailes, SMV;
Parkin, IP;
(2017)
Hydrocarbon detection with metal oxide semiconducting gas sensors modified by overlayer or admixture of zeolites Na-A, H-Y and H-ZSM-5.
Sensors and Actuators B: Chemical
, 242
pp. 1281-1295.
10.1016/j.snb.2016.09.006.
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Hydrocarbon Detection with Metal Oxide Semiconducting Gas Sensors Modified by Overlayer or Admixture of Zeolites Na.pdf - Accepted Version Download (2MB) | Preview |
Abstract
A control thick-film SnO2 gas sensor was modified with zeolites holding LTA, FAU and MFI frameworks using two different approaches to integrate them into the gas-sensing interface. The objective was to prompt selectivity and sensitivity enhancements that were otherwise unattained with the unmodified material when detecting a range of hydrocarbon vapours with similar molecular structures and kinetic diameters. Molecules with different functional groups were also explored. Overlayers were designed by screen-printing 1 or 3 zeolite depositions on top of the control sensor. Admixtures were prepared by screen-printing composites of the control material with 10% (w/w) and 30% (w/w) of zeolite. Tests were performed against ethane, propane, butane, ethanol, isopropanol, acetone, toluene and carbon monoxide at concentrations in the 2.5–125 ppm range and sensors were heated to temperatures in the 250–500 °C range. Sensors were also exposed to humid air and to a mixture of ethane and humid air to assess the selective capabilities of the sensing materials in mixed-gas environments. Both fabrication methods provided sensor responses that, combined, favoured vapour discrimination in a way unachievable with the control sensor and the presence of zeolite was seen to assist in sensitivity and selectivity enhancements towards vapours, whilst providing stable and repeatable responses over time.
| Type: | Article |
|---|---|
| Title: | Hydrocarbon detection with metal oxide semiconducting gas sensors modified by overlayer or admixture of zeolites Na-A, H-Y and H-ZSM-5 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.snb.2016.09.006 |
| Publisher version: | http://doi.org/10.1016/j.snb.2016.09.006 |
| Language: | English |
| Additional information: | © 2016 Published by Elsevier B.V. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Technology, Chemistry, Analytical, Electrochemistry, Instruments & Instrumentation, Chemistry, MOS gas sensor arrays, Zeolite modification, SELECTIVITY ENHANCEMENT, FILMS, THICK, DIOXIDE, MARKERS, OZONE, PART |
| 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 Engineering Science > Dept of Computer Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10045165 |
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