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Permanent link (DOI): https://doi.org/10.7939/R3NC5SM7D

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Free-standing Silicon Quantum Dot Photoluminescence Open Access

Descriptions

Other title
Subject/Keyword
Silicon
Quantum Dot
Photoluminescence
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Lockwood, Ross A
Supervisor and department
Meldrum, Al (Physics)
Examining committee member and department
Davis, John (Physics)
Freeman, Mark (Physics)
Hegmann, Frank (Physics)
Mascher, Peter (Engineering Physics)
Veinot, Jonathan (Chemistry)
Department
Department of Physics
Specialization

Date accepted
2015-01-22T11:37:04Z
Graduation date
2015-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
This thesis focuses on the photoluminescence (PL) of free-standing silicon quan- tum dots (QDs). Large changes in the emission spectrum were found to occur when the QDs were exposed to different environments while undergoing short-wavelength laser irradiation, a phenomenon that was the main focus of this thesis. In particular, the PL can change in intensity by orders of magnitude, either increasing or decreas- ing, depending on the gases or vapors present in the surrounding atmosphere. The presence of chemical species with -OH groups produced especially strong and rapid effects, when in the presence of oxygen. This process was found to feature a rapid reconstruction and oxidation of the Si-QD surface, as measured by Fourier transform infrared spectroscopy (FTIR) and electron spin resonance (ESR). A model for the physical and chemical changes that silicon QDs undergo during these surprisingly strong changes in the PL intensity was developed, factoring in the results from a range of experiments. The effects reported here suggest that silicon QDs could be used to "sense" changes in the surrounding atmosphere. Therefore, a silicon-QD- based fiber optic sensor was demonstrated and its viability for detecting ethanol and water vapors was established. Finally, the outstanding challenges and potential for future research were discussed in light of improving the selectivity and detection limits for sensors based on the luminescence of free-standing silicon QDs.
Language
English
DOI
doi:10.7939/R3NC5SM7D
Rights
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 these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before 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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