Anodized nanoporous WO3 Schottky contact structures for hydrogen and ethanol sensing

Ab Kadir, R, Zhang, W, Wang, Y, Ou, J, Wlodarski, W, O'Mullane, A, Bryant, G, Taylor, M and Kalantar Zadeh, K 2015, 'Anodized nanoporous WO3 Schottky contact structures for hydrogen and ethanol sensing', Journal of Materials Chemistry A, vol. 3, no. 15, pp. 7994-8001.


Document type: Journal Article
Collection: Journal Articles

Title Anodized nanoporous WO3 Schottky contact structures for hydrogen and ethanol sensing
Author(s) Ab Kadir, R
Zhang, W
Wang, Y
Ou, J
Wlodarski, W
O'Mullane, A
Bryant, G
Taylor, M
Kalantar Zadeh, K
Year 2015
Journal name Journal of Materials Chemistry A
Volume number 3
Issue number 15
Start page 7994
End page 8001
Total pages 8
Publisher Royal Society of Chemistry
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 diodebased 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.
Subject Analytical Chemistry not elsewhere classified
Keyword(s) nanostructured tungsten-oxide
gas sensors
thin-film
sensitive properties
mesoporous oxides
temperature
catalysts
diodes
no
conductivity
DOI - identifier 10.1039/c4ta06286h
Copyright notice © The Royal Society of Chemistry 2015
ISSN 2050-7488
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