Crystalline Characterization and Photodecomposition Properties of Rod-Shaped Na_2Ti_6O_(13) Powder Prepared by Molten Salt Process

摘要

To prepare one-dimensional nanostructured Na_2Ti_6O_(13) powder, the starting materials of TiO_2, NaCl and Na_2CO_3 were mixed and then heat-treated at 1000℃ for 2 hrs in air under molten state of NaCl. Changes in shape and phase, photo absorbance and photocatalytic ability of TiO_2 particle were observed controlling added amount of Na_2CO_3 under constant weight ratio of TiO_2 to NaCl using SEM, X-ray diffractometer, Raman spectroscopy, and UV-Vis spectroscopy. The TiO_2 particle was changed into rod-shape Na_2Ti_6O_(13) with the addition of Na_2CO_3, showing increase in optical energy band-gap of the powder as well as gradual decrease of the photo-decomposition ability.