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Optical properties of vanadium oxide nanostructures synthesized by laser pyrolysisShikwambana, Lerato David 28 February 2012 (has links)
M.Sc., Faculty of Science, University of the Witwatersrand, 2011 / In this work, the primary investigation has been on the development of the laser
pyrolysis setup and its optimization for the synthesis of nano-size VO2-x films.
More specifically the focus was on making VO2-x depositions using various laser
pyrolysis parameters and establish in this way (1) an optimum laser wavelength
threshold for the photon induced dissociation of the molecular precursors while
the thermal contribution was kept minimal by using low power density (laser
energy of 30 W) and (2) the lower threshold for pure thermal contributions by
working with wavelengths far from resonance in order to minimize pure photon
induced contributions. The interest in synthesizing nano-size VO2-x materials
stems from the low metal-insulator transition temperature at near room
temperature with opto-electronic and thermo-electronic properties that can be used
in specialised applications.
A large number of samples were synthesized under various conditions and
annealed under argon atmosphere for 17 hours. XRD analysis identified the
VO2 (B) and/or β-V2O5 vanadium oxide phases characteristic for certain samples
grown under optimum conditions. Raman spectroscopy also confirmed these
vanadium oxide phases with bands observed at 175, 228, 261, 303, 422 and 532
cm-1. SEM analysis revealed a plethora of different nanostructures of various size
and shapes. The particles have a range of sizes between 55 nm to 185 nm in
diameter. The particles showed morphologies which included nano-rods, nanospheres
and nano-slabs. An interesting phenomenon was observed on the samples
synthesized with high power density, which was observed and reported by Donev
iii
et al. EDS analysis on the particles was also used to probe the elemental
composition of the sample. Optical studies were performed on the samples which
showed transitions in the visible and infrared region in accordance with the ones
observed in the international literature using different nano-synthesis methods.
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Approach to develop reverse micelle large-scale synthesis process for magnetic nanopowders /Sinha, Kaustav. January 2005 (has links)
Thesis (M.S.)--University of Nevada, Reno, 2005. / "August, 2005." Includes bibliographical references. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
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Block copolymer thin films for nanometer pattern generation and nanostructure synthesisWang, Hai, January 2006 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.
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Ultrafast third-harmonic generation from nanostructured optical thin films and interfacesStoker, David Stevens, January 1900 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.
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Development of elastomers and elastomeric nanocomposites from plant oilsZhu, Lin. January 2006 (has links)
Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: Richard P. Wool, Dept. of Chemical Engineering. Includes bibliographical references.
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Resonant Andreev reflections in superconductor-carbon-nanotube devicesWei, Yadong. January 2000 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 100-102).
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Fabrication of superparamagnetic and ferromagnetic nanoparticlesPoudyal, Narayan. January 2008 (has links)
Thesis (Ph.D.) -- University of Texas at Arlington, 2008.
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Three-dimensional patterning using ultraviolet curable nanoimprint lithography : a thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical and Computer Engineering at the University of Canterbury, Christchurch, New Zealand /Mohamed, Khairudin. January 1900 (has links)
Thesis (Ph. D.)--University of Canterbury, 2009. / Typescript (photocopy). "October 2009." Includes bibliographical references (p. 147-162). Also available via the World Wide Web.
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Applications of graphene for transparent conductors and polymer nanocomposites /Wang, Shu Jun. January 2009 (has links)
Includes bibliographical references (p. 87-95).
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Preparation and characterization of magnetically aligned carbon nanotube buckypaper and compositeShankar, Kadambala Ravi. Wang, Ben. January 2003 (has links)
Thesis (M.S.)--Florida State University, 2003. / Advisor: Dr. Ben Wang, Florida State University, College of Engineering, Dept. of Industrial Engineering. Title and description from dissertation home page (viewed Mar. 2, 2004). Includes bibliographical references.
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