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Synthesis of Doped Titania Nanotube Arrays by Anodizing of Titanium and Surveying of their band Gap

Meftahi, Mohammad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45953 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad
  7. Abstract:
  8. In recent decade, photocatalystic properties of titania nanotube and its mechanisms has been considered greatly in many researches. One of the major ways to increase photocatalystic properties and extending the usage of TNTs is doping them with various elements and modifying their band structure. In present research doped TNTs were prepared by doping of Molybdenum, Nitrogen, and Carbon elements by anodizing method in about of 35 degrees of centigrade and constant voltage of 20V on the surface of titanium sheet. Structural and photocatalystic properties of as-prepared TNTs were studied using field emission scanning electron microscope (FESEM), x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDS), UV- vis spectroscopy and decomposition of the organic material of methylene blue under UV and visible irradiation. Results showed that simultaneous entering of these elements into titania lattice can decrease its gap energy from 2.9 to 2.6 eV, but by further increasing doped species concentration in anodizing bath, energy gap increases to 2.8 eV. Investigation on methylene blue decomposition on surface showed that, Molybdenum and Nitrogen entrance into TNTs lattice can increase methylene blue decomposition rate from 23.6% to 64.3% in 2.5 hours. In other words, structure and photocatalystic activity of TNTs depends on synthesizing conditions and anodizing bath completely, in this method. Due to high specific area and one-dimensional geometry of the TNTs, adsorption and decomposition of methylene blue is performed by more efficiencyand TNTs are proper option in photocatalystic applications
  9. Keywords:
  10. Anodizing ; Energy Gap ; Titania ; Photocatalyst ; Titanium Oxide Nanotube

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