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Proceedings 2017, 1(4), 466; doi:10.3390/proceedings1040466

H2-Sensing Performance of 2D WO3 Nanostructure—Effect of Anodization Parameter

1
Nanoelectronics and MEMS Laboratory, National Electronics and Computer Technology Center, National Science and Technology Development Agency, KlongLuang, Pathumthani 12120, Thailand
2
School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
*
Author to whom correspondence should be addressed.
Published: 17 August 2017
Download PDF [1475 KB, uploaded 17 August 2017]

Abstract

In this work, we investigate the effect of HNO3 anodizing solution concentration ranging from 1.5 to 3 M on H2-sensing performance of 2D WO3 nanostructures prepared by anodizing sputtered tungsten films. The thickness of WO3 nanosheets was found to reduce while the crystallinity degraded with increasing HNO3 concentration. However, the nanosheets anodized in 2 M HNO3 exhibited the highest response of 43.4 to 1 vol % H2, which was one order of magnitude larger than those fabricated with other concentrations at the optimal operating temperature of 350 °C. In addition, the optimal nanostructures displayed good H2 selectivity against NO2, CH4, C2H2 and C2H5OH.
Keywords: two-dimensional WO3; semiconducting oxide; hydrogen sensor two-dimensional WO3; semiconducting oxide; hydrogen sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wisitsora-at, A.; Phokaratkul, D.; Jaruwongrangsee, K.; Daniels, T.M.; Wlodarski, W. H2-Sensing Performance of 2D WO3 Nanostructure—Effect of Anodization Parameter. Proceedings 2017, 1, 466.

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