Catalytic probes with nanostructured surface for gas/discharge diagnostics : a study of a probe signal behaviour

Drenik, A., Cvelbar, U., Ostrikov, K., & Mozeti, M. (2008) Catalytic probes with nanostructured surface for gas/discharge diagnostics : a study of a probe signal behaviour. Journal of Physics D : Applied Physics, 41(11).

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Catalytic probes are used for plasma diagnostics in order to quantify the density of neutral atoms. The probe response primarily depends on the probe material and its surface morphology. Here we report on the design, operation and modelling of the response of niobium pentoxide sensors with a flat and nanowire (NW) surfaces. These sensors were used to detect neutral oxygen atoms in the afterglow region of an inductively coupled rf discharge in oxygen. A very different response of the flat-surface and NW probes to the varying densities of oxygen atoms was explained by modelling heat conduction and taking into account the associated temperature gradients. It was found that the nanostructure probe can measure in a broader range than the flat oxide probe due to an increase in the surface to volume ratio, and the presence of nanostructures which act as a thermal barrier against sensor overheating. These results can be used for the development of the new generation of catalytic probes for gas/discharge diagnostics in a range of industrial and environmental applications.

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26 citations in Web of Science®

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ID Code: 73947
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: sensors, remote sensing, high-frequency discharges, RF discharges, plasma physics
DOI: 10.1088/0022-3727/41/11/115201
ISSN: 1361-6463
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 Institute of Physics Publishing Ltd.
Deposited On: 15 Jul 2014 22:45
Last Modified: 16 Jul 2014 23:52

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