| Résumé : |
Nanocrystalline materials are currently receiving much attention by virtue of their special chemical, physical, and mechanical properties. Of these materials, nanosized titanium dioxide has been of great interest because it exhibits many modified electronic and optical properties as well as extensive application, including photo catalysis and photo electrochemical solar cells
Titanium dioxide (TiO2) is extensively used as a photo catalyst due to the strong oxidizing power of its holes, high photo stability and redox selectivity. TiO2 sols were prepared by the hydrolysis and condensation of titanium (IV) n-butoxide in isopropyl alcohol. The particle dimensions and morphology of the product were examined by transmission electron microscopy (TEM), the crystal structure by X-ray diffraction (XRD) and chemical state was identified by electron spectroscopy for chemical analysis.
The particle size by scanning electron microscopy was in the range of 4-10 nm. The X-ray diffraction data revealed that the nanoparticles possess mostly a tetragonal crystal structure of anatase. The adsorption of the tetrahedral titanium species at 280nm on UV spectra exhibited the quantum size effect of the nanoparticles.
High-purity anatase TiO2 nanoparticles were prepared using a low-temperature sol-gel route. The as-prepared sample was characterized by X-ray diffraction, transmission electron microscopy, infrared spectroscopy, thermo gravimetric analysis, UV-vis spectroscopy, and photo luminescence. It is shown that the as-prepared sample crystallized in a pure anatase phase with an average crystallite size of about 7nm, and the surfaces were highly hydrated. Syntheses of TiO2 nanoparticle by different methods were conducted by various researchers. This abstract is high light of the various synthesis methods. |
Aller sur edunet
Accueil
Ajouter le résultat dans votre panier Affiner la recherchePreparation TiO2 nano particle by different synthesis methods in PAINTINDIA, Vol. LVIII, N° 3 (03/2008)
