The Preparationt of Nanocomposite Titania Sol with Transition Metal Element

抄録

Doped TiO₂ sol were synthesized by hydrothermally treating aqueous TIOCl₂ added with transition metal chlorides such as VOCl₂, CrCl₂, FeCl₃, NiCl₂ and NbCl₅. Highly crystallized antase was obtained in all samples, as examined by XRD and TEM. Undoped pure titania sol has arrow-tip like shape with 20∼30nm but doped TiO₂ sol has needle like shape with 10∼25nm. When doping Nb ion, TiO₂ particle showed spherical shape with diameter less than 20nm due to Nb ion acting a in inhibitor for the particle growth. With increasing aging temperature and time, the TiO₂ particle grew abruptly. From the UV-VIS results, the transition metal doped TiO₂ sol has higher absorption than Undoped TiO₂ sol, together with larger visible sensitivity.