Effect of Process Parameters on Crystal Types and Microstructure of TiO_2 Nanocrystalline Powders

摘要

TiOsub2/sub nanocrystalline powders were prepared by sol-gel method with different process parameters. The phase, morphology and the luminescent property of TiOsub2/sub nanocrystalline powders were characterized by XRD, SEM and PL, respectively. The results indicated that the synthesized TiOsub2/sub nanocrystalline powders were transformed from anatase into rutile with the increasing of heat treatment temperature, which begin at the temperature of 500 oC and was almost completed at the temperature of 700 oC. And with the increasing of pH value the rutile proportion become larger, the nanograins become fine and powders agglomeration was decreased. The good performance TiOsub2/sub nanocrystalline powders were obtained when prepared temperature was 500°Cand pH value was 4. PL results show broad and strong luminescence band appeared near 470nm when TiOsub2/sub nanocrystalline powders were excited at 325nm at room temperature.