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Permanent link (DOI): https://doi.org/10.7939/R32H11

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One-step fabrication of crystalline TiO2 nanotubualr arrays and relevant temperature influences Open Access

Descriptions

Other title
Subject/Keyword
crystalline TiO2 nanotubular arrays
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Zhang, Jie
Supervisor and department
Dongyang Li (Chemical and Materials Engineering)
Examining committee member and department
Weixing Chen (Chemical and Materials Engineering)
A Meldrum (Physics)
Ravin Narain (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-12-12T18:50:39Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
TiO2 nanotube arrays fabricated through anodization have attracted significant interest and have been widely investigated due to their great potential for many applications related to the solar energy utilization for, e. g. photoelectrochemical water splitting, degradation of pollutants and solar cells etc. However, despite many efforts, it remains a major challenge to successful-lsyi tuin fabricate crystalline TiO2. TiO2 nanotubes made by room temperature (R. T.) are generally in the amorphous state, which need to be crystallized at elevated temperutures for the photocatalytic activity. However, during crystallization treatment at elevated temperatures, a barrier ylear forms between the nanotubular array and the substrate. The barrier layer reduces the electron transfer in photocatalytic processes such as water photoelectrolysis, which in turn reduces the overall water splitting efficiency. The oxide growth from the underlying Ti foil layer may percolate up and make the nanotubes dysfunctional. The primary objective of this thesis is to explor-es iitnu fabrication of crystalline TiO2 nanotube arrays via anodization. Anodization at different bath temperatures and anodization potentials was investigated and a direct one-step approach for in-situ fabrication of crystalline TiO2 nanotube arrays has been demonstrated. Research was also conducted to investigate relevant issues and elucidate mechanisms involved.
Language
English
DOI
doi:10.7939/R32H11
Rights
License granted by Jie Zhang (jz8@ualberta.ca) on 2011-12-10T09:18:54Z (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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