Title:
Nanocarving of Titania Surfaces Using Hydrogen Bearing Gases

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dc.contributor.advisor Sandhage, Kenneth H.
dc.contributor.author Rick, Helene Sylvia en_US
dc.contributor.committeeMember Robert L. Snyder
dc.contributor.committeeMember Sheikh A. Akbar
dc.contributor.department Materials Science and Engineering en_US
dc.date.accessioned 2005-09-16T14:59:34Z
dc.date.available 2005-09-16T14:59:34Z
dc.date.issued 2005-05-18 en_US
dc.description.abstract An investigation of surface structures formed on polycrystalline and single crystal TiO2 (titania) samples having under gone various heat treatments in a controlled hydrogen bearing atmosphere was conducted. The study included the recreation and examination of the process discovered by Sehoon Yoo at Ohio State University to form nanofibers on the surface of polycrystalline TiO2 disks. Fibers were formed by heating samples to 700??in a 5%H2 95%N2 gas stream. The nanofibers formed during this processes are approximately 5-20 nanometers in diameter and can be 100??f nanometers long. The fibers do not actually grow on the surface, but are what remain of the surface as the material around them is removed by the gas stream V i.e., nanocarving. The mechanism of fiber formation and the effect of varying experimental parameters remained unknown and were explored within this study. This included changing gas composition, flow rate, and changes in sample preparation. The effect of isovalent doping and impurities within the starting powder were examined. Sintering temperature and time was investigated to determine the effect of grain size and surface morphologies prior to nanocarving. The effect of elevated temperature and 5%H2 95%N gas on the surface of TiO2 single-crystal wafers was also investigated. Test methods include Thermogravimetric Analysis (TGA), Mass Spectrometry (MS), Scanning Electron Microscopy (SEM), and X-ray diffraction (XRD) analysis. en_US
dc.description.degree M.S. en_US
dc.format.extent 9535214 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/7116
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Nanofibers en_US
dc.subject Nanocarving
dc.subject TiO2
dc.subject Titania
dc.subject.lcsh Nanostructured materials en_US
dc.subject.lcsh Titanium dioxide en_US
dc.subject.lcsh Crystals Structure en_US
dc.subject.lcsh Crystals Surfaces en_US
dc.title Nanocarving of Titania Surfaces Using Hydrogen Bearing Gases en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.corporatename School of Materials Science and Engineering
local.contributor.corporatename College of Engineering
relation.isOrgUnitOfPublication 21b5a45b-0b8a-4b69-a36b-6556f8426a35
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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