3. Results and discussion Fig. 1(A) shows the FE-SEM image of the TiO2 spheres prepared without using ammonia during hydrothermal reaction. Fig. 1(B)shows the FE-SEM image of the TiO2spheres with using ammo-nia during hydrothermal reaction
3. Results and discussionFig. 1(A) shows the FE-SEM image of the TiO2 spheres prepared without using ammonia during hydrothermal reaction. Fig. 1(B)shows the FE-SEM image of the TiO2spheres with using ammo-nia during hydrothermal reaction