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Humidity dependence of commercial thick and thin-film MOX gas sensors under UV illumination
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Ayyala, Sai Kiran and Covington, James A. (2021) Humidity dependence of commercial thick and thin-film MOX gas sensors under UV illumination. In: 8th International Electronic Conference on Sensors and Applications, Virtual conference, 1–15 Nov 2021. Published in: Engineering Proceedings, 10 (1). doi:10.3390/ecsa-8-11246 ISSN 2673-4591. (In Press)
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Official URL: http://doi.org/10.3390/ecsa-8-11246
Abstract
Enhancing the performance of a chemo-resistive gas sensor is often challenging due to environmental humidity influencing its sensitivity and baseline resistance. One of the most promising ways of overcoming this challenge is through ultraviolet (UV) illumination of the sensing material. Most research has focused on using UV with in-house developed sensors, which has limited their widespread use. In this work, we have evaluated if UV can enhance the performance of commercially available MOX-based gas sensors. The performance of five different MOX sensors has been evaluated, specifically SGX Microtech MiCS6814 (thin-film triple sensor), FIGARO TGS2620 (n-type thick film), and Alphasense VOC sensor (p-type thick film). These sensors were tested towards isobutylene gas under UV light at different wavelengths (UV-278 nm and UV-365 nm) to investigate its effect on humidity, sensitivity, baseline drift, and recovery time of each sensor. We found the response time of thin-film sensors for reducing gases was improved by 70 s under UV- 365 nm at normal operating temperatures. In addition, all the sensors were left in a dirty environment and the humid-gas testing was repeated. However, due to their robust design, the sensitivity and baseline drift of all the sensors remained the same. This indicates that UV has only limited uses with commercial gas sensors.
| Item Type: | Conference Item (Paper) | ||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Library of Congress Subject Headings (LCSH): | Gas detectors, Metal oxide semiconductors, Thin films, Thick films, Ultraviolet radiation | ||||
| Journal or Publication Title: | Engineering Proceedings | ||||
| Publisher: | MDPI | ||||
| ISSN: | 2673-4591 | ||||
| Book Title: | The 8th International Electronic Conference on Sensors and Applications | ||||
| Official Date: | 1 November 2021 | ||||
| Dates: |
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| Volume: | 10 | ||||
| Number: | 1 | ||||
| Article Number: | 10 | ||||
| DOI: | 10.3390/ecsa-8-11246 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | In Press | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Date of first compliant deposit: | 7 February 2023 | ||||
| Date of first compliant Open Access: | 7 February 2023 | ||||
| Version or Related Resource: | Proceedings of The 8th International Electronic Conference on Sensors and Applications | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 8th International Electronic Conference on Sensors and Applications | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Virtual conference | ||||
| Date(s) of Event: | 1–15 Nov 2021 |
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