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Synthesis and Microstructure of Multi Valent Heavily Doped TiO2 Ceramics

Motahari, Majid | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 50368 (56)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Nemati, Ali
  7. Abstract:
  8. In this project, the nanostructured titanium oxide with heaily doping of oxides of cerium and tin was synthesized using the sol-gel process and its properties were studied. To synthesize TiO2, titanium tetraisopropoxide precursor was used. Cerium nitrate and aqueous tin chloride precursors were utilized for cerium and tin synthesis. Then, they were mixed with Titania precursor causing a severe doping. After that, a gel was produced and it was aged and eventually, it was dried and calcined. XRD and SEM were used to determine the phase and particle size SEM and XRD results showed that doping had great impact on TiO2 crystals. The approximate size of nanoparticles was calculated using Debye-Scherrer equation. With increasing calcination temperature, TiO2 nanoparticles size increased from 18.6 nm at 450 ° C to 31.26 nm at 650 ° C and to 51.23 nm at 750 ° C, The size of TiO2 was increased by increasing the amount of Sn doping from to 52.69 nm, but at higher amount of dopant, the nanoparticle size was 20.57 nm. X-ray diffraction results showed that increasing the calcination temperature caused the transformation of anatase to rutile phase. Adding the tin to TiO2 structure increased the transformation of anatase phase to rutile, while cerium dupont prevents the phase transformation
  9. Keywords:
  10. Cerium ; Tin ; Titanium Dioxide ; Sol-Gel Method ; Photocatalyst ; Titania

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