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Micro-arc oxidized S-TiO2 nanoporous layers: Cationic or anionic doping?

Bayati, M.R ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matlet.2010.07.010
  3. Publisher: 2010
  4. Abstract:
  5. S-doped TiO2 layers were grown on titanium substrates by MAO process. SEM results revealed a porous morphology with a pore size of 40-100 nm. Our XRD analysis showed that the anatase relative content reached its maximum value at the voltage of 500 V. The existence of sulfur in the states of S 4+ and S6+ which substituted Ti4+ in the titania crystalline lattice was confirmed by XPS results; meanwhile, no S 2- was detected. That is, a cationic doping was observed. EDS results showed that sulfur concentration in the layers increased with the voltage. The band gap energy was also calculated as 2.29 eV employing a UV-Vis spectrophotometer
  6. Keywords:
  7. Porosity ; TiO2 ; Band gap energy ; Crystalline lattice ; Doping ; Maximum values ; Microarc ; Microarc oxidation ; Nano-materials ; Nanoporous layers ; Porous morphology ; S-doped TiO ; SEM ; Sulfur concentrations ; TiO ; Titania ; Titanium substrates ; UV-Vis spectrophotometers ; XPS ; XRD analysis ; Dyes ; Nanostructured materials ; Oxidation ; Sulfur ; Titanium ; Titanium dioxide ; Doping (additives)
  8. Source: Materials Letters ; Volume 64, Issue 20 , 2010 , Pages 2215-2218 ; 0167577X (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0167577X10005525