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Syntheses and Optical Properties of Silicon Based Nanomaterials Open Access


Other title
Silicon nanomaterials
Quantum dots
Type of item
Degree grantor
University of Alberta
Author or creator
Dasog, Mita
Supervisor and department
Veinot, Jonathan G. C. (Chemistry)
Examining committee member and department
Mar, Arthur (Chemistry)
McDermott, Mark T. (Chemistry)
Gates, Byron (Chemsitry, SImon Fraser University)
Rivard, Eric (Chemistry)
Goss, Greg (Biological Sciences)
Department of Chemistry

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Silicon (Si) based nanomaterials have the potential to revolutionize the microelectronics industry by introducing desirable nanoscale properties into electronic components without compromising the material composition. They have also been proposed as a greener alternative for many Group III-V and II-VI semiconductors. However, the high temperature and costly infrastructure required for the large scale synthesis and characterization of Si based materials still poses a challenge that impedes their widespread application. This thesis describes the synthesis of silicon (Si), silicon carbide (SiC), silicon nitride (Si3N4), and silica (SiO2) nano- and micromaterials from compositionally tuned sol-gel polymers. Si based materials were prepared either via disproportionation of (RSiO1.5)n sol-gel polymers or by a magnesiothermic reduction method. Magnesiothermic reduction was carried out at the lowest temperature reported in the literature to date (500 - 600 oC) to make Si, Si3N4, and SiC materials with various morphologies. Detailed chemical investigations were carried out to understand the origin of blue luminescence in Si nanocrystals (NCs). It was determined that the presence of nitrogen, oxygen, and chlorine based impurities in trace amounts can lead to blue emission via a charge transfer process. Si-NCs with various surface protecting groups were synthesized in order to tune their luminescence across the visible spectrum. The luminescence is believed to originate from surface defects, and the excited state lifetimes of such emissions are short lived (a few nanoseconds). This is the first example to demonstrate emission across the visible spectrum by tuning the surface protecting groups. The materials and methodologies summarized in this thesis open up new avenues in the pursuit of Si nanomaterial based photovoltaics, sensors, biological applications, redox reactions, greenhouse gas sequestration, and many more.
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.
Citation for previous publication
M. Dasog, C. Rachinsky and J. G. C. Veinot, J. Mater. Chem., 2011, 21, 12422 - 12427M. Dasog, Z. Yang and J. G. C. Veinot, CrystEngComm., 2012, 14, 7576 - 7578M. Dasog and J. G. C. Veinot, Chem. Commun., 2012, 48, 3760 - 3762M. Dasog, L. F. Smith, T. K. Purkait and J. G. C. Veinot, Chem. Commun., 2013, 49, 7004 - 7006M. Dasog, Z. Yang, S. Regli, T. M. Atkins, A. Faramus, M. P. Singh, E. Muthuswamy, S. M. Kauzlarich, R. D. Tilley, J. G. C. Veinot, ACS Nano, 2013, 7, 2676 - 2685O. Wolf, M. Dasog, Z. Yang, I. Balberg, J. G. C. Veinot, O. Millo, Nano Lett., 2013, 13, 2516 - 2521

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