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Synthesis of SiO2/Gd(OH)CO3/TiO2 Core/Shell Nanocomposite for Biological Applications

Khakzadian Abarghouei, Jafar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43700 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Hosseini, Madaah
  7. Abstract:
  8. Inthisresearch,silicananoparticleswere synthesized ymicroemulsionmethod. Thengadoliniumcarbonatewascoated onsilicananoparticles by depositiontechnique.After thatTiO2wascoatedbydeposition techniqueonsilica/gadolinium carbonatenanoparticles.The results of infrared spectroscopy (FT-IR) on silica/gadolinium carbonatesamples showed carbonate bonds. The results of X-ray diffraction (XRD) test on samples of silica/gadolinium carbonatethat had been calcined at 600 0C for 2 h, showed that silica and gadolinium carbonate phases are amorphous and with increasing calcination temperature, gadolinium oxide crystalline phase is formed. For TiO2 coatings process, the effect of TBOT concentration, the concentration of water and heat treatment parameters were investigated. X-ray diffraction test results showed that the TiO2 phase after heat treatment at 600 0C is the anatase.Particle size and morphology were studied using Field emission-scanning electron microscope images (FE-SEM). Images showed that particles morphology is spherical and particles size distribution isnarrow and at any stage of the synthesis, the coating thickness can be controlled. In order to prove the structure of the core/shell, nanocompositeswere examined by high resolution-transmission electron microscopy (HR-TEM) and the images showed a uniform coatingat each step of the synthesis.Photocatalytic Propertieswere investigatedby amount ofmethylene bluedye decompositionand the resultsshowed thatthephotocatalyticreactionrateis dependent onthe coatingthicknessand effective surfaceofparticles
  9. Keywords:
  10. Silica ; Titanium Dioxide ; Core-Shell Nanostructure ; Photocatalyst ; Gadolinum Carbonate

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