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Synthesis and Characterization of Electrophoretic Deposited One- Imensional Nano Structured Titania

Ordikhani, Farideh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40067 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza; Khomamizadeh, Farzad
  7. Abstract:
  8. Recent studies have indicated that one-dimensional titanium dioxide (TiO2) shows excellent properties in comparison to other forms of TiO2 materials in photocatalysis, sensing, self-cleaning coating and photovoltaic applications. In this project TiO2 nanorods were grown in polycarbonate template, with pore diameter of 200 nm, by solelectrophoretic deposition method. Firstly, properties of TiO2 sol were investigated. The average particle size of TiO2 (measured by zeta sizer instrument) was 17 nm and the zeta potential was around 45 mV, which confirmed good stability of the sol against aging. Moreover, FTIR analysis showed that a full conversion of precursor (titanium isopropoxide) was obtained by hydrolysis reaction, resulted in formation of TiO2 particles. Secondly we focused on determining the optimum conditions to grow TiO2 nanorods by sol-electrophoretic deposition. It was found that the optimum conditions are at potential of 0.3 V/cm and deposition time of 60 min. FE-SEM images show that these aligned nanorods with length of 10 μm are dense and continuous with a uniform diameter of about 145-180 nm throughout their entire length. XRD results indicated that the TiO2 nanorods contained mixtures of anatase and brookite phase at 100ºC, while they showed mixtures of anatase and rutile at 500ºC. SDT analysis also confirmed that crystallization of TiO2 nanorods occurred at a low temperature and anatase to rutile phase transformation happened around 350ºC
  9. Keywords:
  10. Titanium Dioxide ; Nanorod

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