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Inorganic Nanowells and Nanotubes as Templates for Chemical Nanofabrication.

Inorganic Nanowells and Nanotubes as Templates for Chemical Nanofabrication.


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About the Book

Nanoscale materials are demonstrating new properties and promising applications with each passing day. The fabrication of ever more complex and precise nanomaterials represents a continuing drive in the fields of physics, chemistry, and biology. Template-based approaches provide an attractive method of producing new inaccessible materials by modifying and confining older techniques, but most of the templates available today function only in a narrow range of chemical parameters. In this work, new thermally and chemically robust 'nanowell' templates were built to study confined precipitation as a method to fabricate nanomaterials. These templates consisted of two-dimensional arrays of 50 to 100-nm diameter (50-500 zL) hemispherical impressions in silicon and tantalum oxide. We found that after loading these nanowells by discontinuous dewetting the solvent rapidly evaporated, and the solute within each well crystallized into a single nanocrystal. The size of that nanocrystal depended on the size of the well and the concentration of the solution. We reduced metal salt precursor nanoparticles in a high temperature hydrogen atmosphere to fabricate metallic and metal oxide nanoparticles, and experiments were carried out to determine the nature and limits of nanoscale precipitation to generate novel nanomaterials. We found that in the presence of an existing nanoparticle, any new material loaded into the well would preferentially precipitate in contact with the existing nanoparticle. This phenomenon was applied to fabricate intermetallic nanocrystals. To grow tantalum oxide nanowells, we studied the electrochemical self-ordering of anodized tantalum oxide into porous films and nanotubes. We found that in electrolytes of fluorine ions in concentrated sulfuric acid, tantalum films could be electrochemically oxidized into ordered porous structures whose spacing depended linearly on the applied voltage. The structural parameters of these porous films depended on the precise chemical composition of the electrolyte solution. Finally, we found that by annealing these oxide nanotubes under H2S, they could be converted to superconducting tantalum disulfide inorganic fullerenes with a superconducting transition temperature 2 K higher than the bulk transition temperature (0.8 K).


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Product Details
  • ISBN-13: 9781243451668
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • Weight: 231 gr
  • ISBN-10: 1243451661
  • Publisher Date: 02 Sep 2011
  • Binding: Paperback
  • Spine Width: 7 mm
  • Width: 203 mm


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Inorganic Nanowells and Nanotubes as Templates for Chemical Nanofabrication.
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