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Permanent link (DOI): https://doi.org/10.7939/R3ZW18X9N

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Development of an Electronic Nose for Detection of Volatile Organic Compounds Based on Nanoporous Microcantilevers by Using Photothermal Spectroscopy Open Access

Descriptions

Other title
Subject/Keyword
electronic nose
nanoporous microcantilever
anodic aluminum oxide
photothermal spectroscopy
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chae, Inseok
Supervisor and department
Thundat, Thomas (Chemical and Materials Engineering)
Examining committee member and department
Djokic, Stojan (Chemical and Materials Engineering)
Choi, Hyo-Jick (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2015-04-01T14:05:25Z
Graduation date
2015-06
Degree
Master of Science
Degree level
Master's
Abstract
An electronic nose for identification and quantification of volatile organic compounds (VOCs) mixtures was developed using a nanopore-enhanced photothermal cantilever deflection spectroscopy (PCDS). PCDS provides highly selective detection of vapor mixtures of VOCs from specific molecular vibrations in the mid IR region. Nanoporous anodic aluminum oxide (AAO) microcantilevers, fabricated through the self-ordering anodization and simple photolithography, were exploited with PCDS in order to increase the sensitivity. AAO microcantilevers were optimized by tuning the diameter of nanopores in order to enhance the thermomechanical sensitivity and increase the surface area. The thermomechanical sensitivity of a bilayer AAO microcantilever with 60 nm of pore diameter was estimated ~1 μm/K and was found to be much superior to that of plain Si microcantilever due to its nanoporous structure. The adsorbed molecules from vapor mixtures on AAO microcantilevers in humid condition were fully recognized and quantified by measuring the peak amplitudes in PCDS and the resonance frequency shifts of AAO microcantilevers.
Language
English
DOI
doi:10.7939/R3ZW18X9N
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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