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ZnO/MoO3 Heterojunction thick films to detect ppb level Volatile Organic Compounds
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Ayyala, Sai Kiran and Covington, James A. (2022) ZnO/MoO3 Heterojunction thick films to detect ppb level Volatile Organic Compounds. IEEE Sensors Journal, 22 (11). pp. 10353-10360. doi:10.1109/JSEN.2022.3169685 ISSN 1530-437X.
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WRAP-ZnO-MoO3-Heterojunction-thick-films-to-detect-ppb-level-Volatile-Organic-Compounds-Covington-22.pdf - Accepted Version - Requires a PDF viewer. Download (1200Kb) | Preview |
Official URL: http://dx.doi.org/10.1109/JSEN.2022.3169685
Abstract
The development of a fast, stable metal oxide-based VOC sensor for the detection of trace-level ppb concentrations, remains a challenge. Recently, many composite materials have been investigated to try and develop sensors with these characteristics. Here, we report on the development of ZnO/MoO3 heterojunction thick film devices, fabricated by a spin-coating technique, to detect a wide range of VOCs at application relevant ppb level concentrations. For comparison, pristine ZnO and pristine MoO3 devices were also fabricated. Sensors were tested at different temperatures and resulting in an optimum temperature of 380°C. The sensors were tested towards 11 different VOCs at ppb concentrations. Of all the sensors tested, the heterojunction device showed the highest response to VOCs, with the highest sensitivity towards 200 ppb of ethanol (Ra/Rg = 12.84). The results compared well with the pristine materials, with the response of the ZnO material being 6 times smaller and MoO3 10 times smaller compared to their heterojunction counterpart. The response times of the heterojunction device were also faster, at around 30 sec compared with 120 sec for pristine materials.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TP Chemical technology | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Gas detectors, Metallic oxides -- Electric properties, Semiconductors -- Junctions, Zinc oxide -- Thermal properties, Volatile organic compounds | ||||||||
| Journal or Publication Title: | IEEE Sensors Journal | ||||||||
| Publisher: | Institute of Electrical and Electronic Engineers | ||||||||
| ISSN: | 1530-437X | ||||||||
| Official Date: | 1 June 2022 | ||||||||
| Dates: |
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| Volume: | 22 | ||||||||
| Number: | 11 | ||||||||
| Page Range: | pp. 10353-10360 | ||||||||
| DOI: | 10.1109/JSEN.2022.3169685 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Reuse Statement (publisher, data, author rights): | © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Copyright Holders: | IEEE | ||||||||
| Date of first compliant deposit: | 9 May 2022 | ||||||||
| Date of first compliant Open Access: | 10 May 2022 |
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