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Investigation on Synthesis and Properties of TiO2-CNT Nanocomposites Coating on Al Substrate

Shadravan, Aysan | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43114 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Sadeghian, Zahra
  7. Abstract:
  8. The aim of this project is investigation on synthesis and characterization of the TiO2-CNT nanocomposite films on aluminum substrate by sol-gel dip coating method. The pure TiO2 and TiO2-CNT nanocomposite layers were coated on aluminum substrate and heat treated in 400 C. In this work Ti-tetra isopropxide and different amounts of CNTs (5,10,15 %wt), were used for obtain the composites. The coatings were characterized by X-Ray diffraction (XRD) and the crystallite size of TiO2 was calculated by Scherrer formula. The corrosion properties of coating were examined by polarization test, and corrosion resistance of pure TiO2 was compared with TiO2-CNT coatings, and It showed that the composite coatings have better corrosion resistance. The thermal and structural properties of the samples were examined by TG, FTIR, SEM and AFM analysis. The thickness of coating was determined about 550 nm, by the cross section image of SEM. Their photocatalytic activity was investigated by examining the degradation of methylene orange (2 and 10 ppm) under UV irradiation by (UV-Vis) spectroscopy, and it showed that the inclusion of carbon nanotube in the TiO2 matrix leads to increase the photocatalytic activity of coatings. Also, the band gap energy was calculated by absorbance spectroscopy. The minimum band gap energy was obtained 2.23 (ev) for nanocomposite coating containing 10(wt%) carbon nanotube, that this composition have the highest photocatalytic activity
  9. Keywords:
  10. Sol-Gel Method ; Photocatalytic Activity ; Ultra Violet-Visible ; Nano-Composite Coating ; Corrosion Resistance ; Band Gap ; Titanium Oxide-Carbon Nanotube (Tio2-CNT)

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