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AACVD Grown WO3 Nanoneedles Decorated with Ag/Ag2O Nanoparticles for Oxygen Measurement in a Humid Environment

Sari, WP; Blackman, C; Zhu, Y; Covington, J; (2019) AACVD Grown WO3 Nanoneedles Decorated with Ag/Ag2O Nanoparticles for Oxygen Measurement in a Humid Environment. IEEE Sensors Journal , 19 (3) pp. 826-832. 10.1109/JSEN.2018.2878051. Green open access

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Abstract

A sensitive material consisting of silver/silver oxide decorated WO3 was successfully grown in two steps via aerosol-assisted chemical vapour deposition (AACVD). Morphological, structural, and composition analysis revealed our method is effective for growing WO3 nanoneedles decorated with silver/silver oxide nanoparticles at relatively low temperature (≤375°C) onto sensor arrays printed on alumina substrate. The sensors were tested for oxygen under humid environment (relative humidity ~85%) with the concentration ranging between 0% and 20%. Gas sensing results showed good response to oxygen with optimum temperature was observed at 400°C for undecorated WO3 and at 350°C for silver/silver oxide decorated WO3. The addition of silver/silver oxide was found to improve the sensor response by almost 300%, making the sensor a potential alternative to replace existing Pb-based oxygen sensor.

Type: Article
Title: AACVD Grown WO3 Nanoneedles Decorated with Ag/Ag2O Nanoparticles for Oxygen Measurement in a Humid Environment
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JSEN.2018.2878051
Publisher version: https://doi.org/10.1109/JSEN.2018.2878051
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Temperature sensors , Films , Gas detectors , Temperature measurement , Chemical sensors , Substrates , Chemical sensor , Heterojunction , Oxygen detection , Silver oxide , Thin film sensor , Tungsten oxide
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
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
URI: https://discovery.ucl.ac.uk/id/eprint/10061155
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