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| Title: | Characterization and synthesis of nanoscale materials | |
| Alternate Title: | Lattice fringe signatures of epitaxy on nanotubes. Growing ZnO nanowires via diffusion on Au. Effects of catalyst thickness on the growth of zinc oxide nanostructures. Vertically oriented zinc oxide nanocontainers grown on mica substrates. | |
| Author (s): | Wang, Jinfeng, 1978- | |
| Advisor(s): | Fraundorf, Phil Waddill, G. Dan | |
| Department/Lab Affiliations: | ||
| Issue Date: | 2008 | |
| Publisher: | Missouri University of Science and Technology | |
| Abstract: | "This dissertation focuses on the systematic study of techniques for characterization and synthesis of nanoscale materials. We have achieved several goals. Firstly, high number density uniform zinc oxide nanostructure growth has been achieved using thermal evaporation, through control of experimental parameters that include source material temperature, substrate temperature, substrate material, gas flow rate, and choice of catalyst. Aligned zinc oxide nanowires, randomly oriented zinc oxide nanowires, zinc oxide container-shaped structures, and zinc oxide nanobelts have been synthesized with high yield. Secondly, using a one parameter family of lattice fringe geometry curves, we show how to examine the epitaxial relationship between catalyst particles and a cylindrical support. Using digital darkfield techniques, this investigation can be automated. Thirdly, the structure relationship between catalyst particles and zinc oxide nanowires has been investigated using scanning and high resolution scanning transmission electron microscopes. A vapor-solid-solid growth model involving a hexagonal array of aligned growth regions is proposed in zinc oxide nanowire formation. Evidence indicates in particular that gold catalyst particles remain solid during ZnO nanowire growth. Finally, the effect of tin catalyst thickness on nanostructure formation has been investigated. The catalyst abundance on the substrate has a direct impact on its ability to absorb ZnO. The thicker coated substrates can absorb more source vapor, and form larger structures, than can thinner coated substrates"--Abstract, p. iv. | |
| Type: | Thesis/Dissertation text | |
| Copyright Notice: | These materials are protected under copyright by the original author. | |
| Link to this page: | ||
| URL: | ||
| Full Text: |
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| title | Characterization and synthesis of nanoscale materials | |
| title.alternative | Lattice fringe signatures of epitaxy on nanotubes. | |
| title.alternative | Growing ZnO nanowires via diffusion on Au. | |
| title.alternative | Effects of catalyst thickness on the growth of zinc oxide nanostructures. | |
| title.alternative | Vertically oriented zinc oxide nanocontainers grown on mica substrates. | |
| contributor.advisor | Fraundorf, Phil | |
| contributor.advisor | Waddill, G. Dan | |
| contributor.author | Wang, Jinfeng, 1978- | |
| contributor.deptlab | Missouri University of Science & Technology. Dept. of Physics. | |
| contributor.deptlab | University of Missouri--St. Louis. Dept. of Physics. | |
| contributor.sponsor | U.S. Department of Energy | |
| subject.LCSH | Nanostructured materials. | |
| subject.LCSH | Nanostructured materials -- Synthesis. | |
| subject.LCSH | Zinc oxide. | |
| subject.LCSH | Electron microscopy. | |
| subject.LCSH | Semiconductors. | |
| date.issued | 2008 | |
| publisher | Missouri University of Science and Technology | |
| identifier.URI | ||
| identifier.oclc | 244567851 | |
| description | Vita. | |
| description | The entire thesis text is included in file. | |
| description | Title from title screen of thesis/dissertation PDF file (viewed August 28, 2008) | |
| description | Thesis completed as part of a cooperative degree program with Missouri University of Science & Technology and the University of Missouri--St. Louis. | |
| description | Thesis (Ph. D.)--Missouri University of Science and Technology and University of Missouri--St. Louis, 2008. | |
| description | Includes bibliographical references (p. 129-142). | |
| description | System requirements: Adobe Acrobat Reader; Internet browser. | |
| description | Mode of access: World Wide Web. | |
| description.abstract | "This dissertation focuses on the systematic study of techniques for characterization and synthesis of nanoscale materials. We have achieved several goals. Firstly, high number density uniform zinc oxide nanostructure growth has been achieved using thermal evaporation, through control of experimental parameters that include source material temperature, substrate temperature, substrate material, gas flow rate, and choice of catalyst. Aligned zinc oxide nanowires, randomly oriented zinc oxide nanowires, zinc oxide container-shaped structures, and zinc oxide nanobelts have been synthesized with high yield. Secondly, using a one parameter family of lattice fringe geometry curves, we show how to examine the epitaxial relationship between catalyst particles and a cylindrical support. Using digital darkfield techniques, this investigation can be automated. Thirdly, the structure relationship between catalyst particles and zinc oxide nanowires has been investigated using scanning and high resolution scanning transmission electron microscopes. A vapor-solid-solid growth model involving a hexagonal array of aligned growth regions is proposed in zinc oxide nanowire formation. Evidence indicates in particular that gold catalyst particles remain solid during ZnO nanowire growth. Finally, the effect of tin catalyst thickness on nanostructure formation has been investigated. The catalyst abundance on the substrate has a direct impact on its ability to absorb ZnO. The thicker coated substrates can absorb more source vapor, and form larger structures, than can thinner coated substrates"--Abstract, p. iv. | |
| description. statementOfResponsibility | by Jinfeng Wang. | |
| type | Thesis/Dissertation | |
| type.DCMIType | text | |
| rights | These materials are protected under copyright by the original author. | |
| language.ISO639-2 | eng | |
| format.extent | xv, 143 p. : ill., digital, PDF file. | |
| date.accessioned | 2008-08-28T15:34:05Z | |
| date.available | 2008-08-28T15:47:27Z | |
| identifier.persist.URI | ||
| Full Text |
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