A comparison study on hydrogen sensing performance of MoO3 nanoplatelets coated with a thin layer of Ta2O5 or La2O3

Yu, J., Liu, Y., Cai, F.X., Shafiei, M., Chen, G., Motta, N., Wlodarski, W., Kalantar-zadeh, K., & Lai, P.T. (2014) A comparison study on hydrogen sensing performance of MoO3 nanoplatelets coated with a thin layer of Ta2O5 or La2O3. Journal of Applied Science and Engineering, 17(1), pp. 31-38.

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There has been significant interest in developing metal oxide films with high surface area-to-volume ratio nanostructures particularly in substantially increasing the performance of Pt/oxide/semiconductor Schottky-diode gas sensors. While retaining the surface morphology of these devices, they can be further improved by modifying their nanostructured surface with a thin metal oxide layer. In this work, we analyse and compare the electrical and hydrogen-sensing properties of MoO3 nanoplatelets coated with a 4 nm layer of tantalum oxide (Ta2O5) or lanthanum oxide (La2O3). We explain in our study, that the presence of numerous defect traps at the surface (and the bulk) of the thin high-� layer causes a substantial trapping of charge during hydrogen adsorption. As a result, the interface between the Pt electrode and the thin oxide layer becomes highly polarised. Measurement results also show that the nanoplatelets coated with Ta2O5 can enable the device to be more sensitive (a larger voltage shift under hydrogen exposure) than those coated with La2O3.

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ID Code: 68419
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Hydrogen, Gas Sensor, Metal Oxide, Heterostructure
DOI: 10.6180/jase.2014.17.1.05
ISSN: 1933-0421
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 2011 Rochester Institute of Technology, College of Applied Science and Technology
Deposited On: 13 Mar 2014 04:37
Last Modified: 18 Mar 2015 02:17

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