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Permanent link (DOI): https://doi.org/10.7939/R31W7S

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Ultraviolet stabilization and performance enhancement of nanostructured humidity sensors Open Access

Descriptions

Other title
Subject/Keyword
light emitting diode
glancing angle deposition
thin film
photocatalytic regeneration
humidity
nanostructured
ageing
porous sensor
ultraviolet
titanium dioxide sensor
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Smetaniuk, Daniel
Supervisor and department
Brett, Michael (Electrical and Computer Engineering)
Examining committee member and department
Finlay, Warren (Mechanical Engineering)
McMullin, James (Electrical and Computer Engineering)
Department
Department of Electrical and Computer Engineering
Specialization

Date accepted
2011-10-18T20:15:37Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
Glancing angle deposition (GLAD) was used to fabricate nanostructured TiO$_2$ capacitive relative humidity (RH) sensors. These sensors exhibit sub-second response times and large sensitivities, but are susceptible to ageing. Ultraviolet (UV) treatment of the sensors has been found to reverse ageing and enhance sensor performance. This thesis presents research investigating the UV stabilization and performance enhancement of GLAD RH sensors. The UV treatment was characterized using a mercury vapour lamp and optical filters to isolate UV wavelengths. Treatment and long-term stabilization with UV light-emitting diodes (LEDs) was studied and 370 nm was identified as the optimum LED wavelength for stabilization. A custom 8-channel impedance analyzer that was built will allow for parallel sensor testing in future experimentation to optimize the UV treatment. The goal is to eventually combine a capacitive sensor with UV LEDs in a self-stabilizing sensing platform.
Language
English
DOI
doi:10.7939/R31W7S
Rights
License granted by Daniel Smetaniuk (dan.smetaniuk@ualberta.ca) on 2011-10-17T22:36:29Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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