A hydrogen/methane sensor based on niobium tungsten oxide nanorods synthesised by hydrothermal method

Yu, J., Hao, W., Shafiei, M., Field, M.R., Liu, Z.F., Wlodarski, W., Motta, N., Li, Y.X., Kalantar-zadeh, K., & Lai, P.T. (2013) A hydrogen/methane sensor based on niobium tungsten oxide nanorods synthesised by hydrothermal method. Sensors and Actuators B : Chemical, 184, pp. 118-129.

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An investigation on hydrogen and methane sensing performance of hydrothermally formed niobium tungsten oxide nanorods employed in a Schottky diode structure is presented herein. By implementing tungsten into the surface of the niobium lattice, we create Nb5+ and W5+ oxide states and an abundant number of surface traps, which can collect and hold the adsorbate charge to reinforce a greater bending of the energy bands at the metal/oxide interface. We show experimentally, that extremely large voltage shifts can be achieved by these nanorods under exposure to gas at both room and high temperatures and attribute this to the strong accumulation of the dipolar charges at the interface via the surface traps. Thus, our results demonstrate that niobium tungsten oxide nanorods can be implemented for gas sensing applications, showing ultra-high sensitivities.

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ID Code: 59215
Item Type: Journal Article
Refereed: Yes
Keywords: niobium oxide, tungsten oxide, nanorods, hydrogen, methane, sensor
DOI: 10.1016/j.snb.2013.03.135
ISSN: 0925-4005
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100) > Sensor Technology (Chemical aspects) (030107)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanomaterials (100708)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier B.V.
Copyright Statement: All rights reserved
Deposited On: 06 May 2013 22:22
Last Modified: 12 Jun 2013 15:43

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