Anodized nanoporous WO3 Schottky contact structure for hydrogen and ethanol sensing

Ab Kadir, Rosmalini, Zhang, Wei, Wang, Yichao, Ou, Jian Zhen, Wlodarski, Wojtek, O'Mullane, Anthony P., Bryant, Gary, Taylor, Matthew, & Kalantar-zadeh, Kourosh (2015) Anodized nanoporous WO3 Schottky contact structure for hydrogen and ethanol sensing. Journal of Materials Chemistry A, 3(15), pp. 7994-8001.

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Abstract

This paper reports the development of nanoporous tungsten trioxide (WO3) Schottky diode-based gas sensors. Nanoporous WO3 films were prepared by anodic oxidation of tungsten foil in ethylene glycol mixed with ammonium fluoride and a small amount of water. Anodization resulted in highly ordered WO3 films with a large surface-to-volume ratio. Utilizing these nanoporous structures, Schottky diode-based gas sensors were developed by depositing a platinum (Pt) catalytic contact and tested towards hydrogen gas and ethanol vapour. Analysis of the current–voltage characteristics and dynamic responses of the sensors indicated that these devices exhibited a larger voltage shift in the presence of hydrogen gas compared to ethanol vapour at an optimum operating temperature of 200 °C. The gas sensing mechanism was discussed, associating the response to the intercalating H+ species that are generated as a result of hydrogen and ethanol molecule breakdowns onto the Pt/WO3 contact and their spill over into nanoporous WO3.

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8 citations in Scopus
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4 citations in Web of Science®

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ID Code: 84907
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Gas sensors, Schottky contact, WO3
DOI: 10.1039/C4TA06286H
ISSN: 2050-7496
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Synthesis of Materials (030306)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Organic Semiconductors (091208)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Royal Society of Chemistry
Deposited On: 21 Jun 2015 22:40
Last Modified: 25 Jun 2015 07:15

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