Synthesis Of Tio 2 Nanoparticles - 2417 Words

INTRODUCTION In nature Titanium Oxide exists in three primary phases, namely, Anatase, Rutile and Brookite. In each case the sizes of different cells vary.[1] In recent years TiO2 has been widely used for preparation of various and varying types of nanomaterials such as nanoparticles, nanorods, nanowires as well as nanoporous TiO2 containing materials.[3] Regardless of its scale Titanium Oxide maintains its photocatalytic activity. Nanoscale TiO2 has an advantage of being surface reactive that fosters its interactions with biological molecules, such as phosphorylated proteins and peptides [4] as well as nonspecific binding with DNA [5]. The surface molecules of nanoscale TiO2 particles are â€Å"on the corner† of the particle and are forced by confinement stress into a pentacoordinated, square-pyramidal orientation. Such molecules have an affinity for stable nanoparticle conjugation to ortho substituted bidentate ligands such as dopamine.[7,8] The various methods used for the synthesis of TiO 2 nanoparticles include sol gel, solvothermal and hydrothermal methods[3], although new methods are now being used. One of the new methods is the use of different dopants in the synthesis of Titanium oxide nanocomposites, such as the different noble metals[11]. Also different nanoparticle coating materials and photosensitizing dyes.[13-17] In this paper the various applications of TiO 2 nanocomposites are briefly summarized. Some of the major applications of TiO2 nanocomposites are in